By Fiachra "Figs" O'Sullivan, LMFT and Teale Taxis, LMFT
Certified EFT Therapist and Certified EFT Supervisor (ICEEFT). Co-founders of Empathi, San Francisco.
You found something. A text. A charge on a card. A tone of voice that did not add up. Or maybe he told you himself, and now you are sitting in a kitchen that looks exactly the same as it did yesterday, except nothing is the same. You are checking his phone. You are asking the same question six different ways. You are swinging from rage to despair inside a single minute, and then you are Googling at 2 a.m. because your body will not let you sleep.
You want a simple answer. You want me to tell you he is a narcissist. A sociopath. Broken in a way that means none of this was your fault and none of it was about you. That story would be easier. You could file it and start planning your exit.
I have been a licensed marriage and family therapist for seventeen years. I have sat with hundreds of couples in the wreckage of an affair. And I have to tell you the truth I see in my office every week. It is more complicated than that. And in a strange way, it is more heartbreaking.
The man on my couch is almost never a monster. In tens of thousands of hours of clinical work, I have met a genuinely narcissistic person maybe five or six times. What I usually see is a wounded human being who made a destructive, tragic choice to survive his own pain, and who is now watching the person he loves come apart in front of him.
That does not excuse anything. It explains it. And if you want a real answer to why married men cheat, you need the explanation, not the label.
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An Affair Is Not One Betrayal. It Is Many.
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Before I say anything about why, I need to name what an affair actually does to you, because most articles skip past this and it matters.
People think an affair is one act. It is not. It is many betrayals wrapped into one. It is the sex or the emotional intimacy with someone else, yes. It is also the lying. The second life he ran without you. The choices he made in the world without ever considering how they would land in your body. The gaslighting when you sensed something was off and he told you that you were paranoid, that you were the problem, that you needed to trust him more.
When a betrayal like this lands, you lose your reality. You look back at the last five years and you cannot tell what was real. Was he texting her on that vacation? When he said he loved me at my father’s funeral, did he mean it? Who was the man I was sleeping next to? It is a form of psychological vertigo, and it is the reason you cannot sleep, cannot eat, cannot stop asking the same questions.
Through the lens of attachment theory, we understand why the injury goes so deep. We are biological creatures. We need to be emotionally bonded from the cradle to the grave. That is not a poetic idea. That is mammalian wiring. Your nervous system rests only because it believes two things are true about your partner. One, I am your priority. Two, I am enough for you.
An affair introduces a third party into the bond. And in doing so, it tells your body, on a level below language, that neither of those things is true. You are not the priority. You are not enough. That is why you are responding the way an infant responds to being left in the wild. Your limbic system is not being dramatic. It is doing what it evolved to do.
So when I answer why he did it, I am not minimizing any of this. Hold both. The devastation is real. And the explanation is not what the internet told you.
What the data shows: in 58,221 completed relationship assessments, the number one unmet need was “like we’re a team”. 24,037 people named it, ahead of understood, loved, heard and appreciated.
The Reluctant Lover: The Man Who Cannot Bear Feeling Not Good Enough
In the framework I teach couples, most men who stray fit a pattern I call the Reluctant Lover. He is the emotional withdrawer. And he is not withdrawing because he does not care. He is withdrawing because he cares too much and cannot bear how much of a disappointment he has come to believe he is.
Underneath the surface of the Reluctant Lover is a deep, often unconscious sensitivity to feeling not good enough. He carries a private conviction that he is failing to measure up, and it is unbelievably painful to feel not good enough for the person you love. Most of the time, he cannot even name this. It lives in his body, not his story.
In the marriage, he often experiences himself as a constant disappointment. When you express a need, his physiology does not register a request for connection. It registers, “you are failing again.” When you sigh at the end of a hard day, he does not hear tiredness. He hears the verdict he has been bracing for since he was a boy. He drops into shame, and shame, when it gets loud enough, does not look for repair. It looks for exit.
This is the mechanism I need you to understand. When the pain of feeling not enough becomes unbearable, the human survival response starts looking for anywhere it can breathe. Some men bury themselves in work. Some in alcohol. Some in scrolling until 3 a.m. And some, tragically, in an affair.
An affair, in this pattern, is not really about sex. It is about the fantasy of being acceptable. With an affair partner, there is no history of letting anyone down. No shared mortgage, no stressed mornings, no look across the kitchen table that says, “you did it again.” He gets to be new. He gets to be wanted without being weighed. In her eyes, for a moment, he is finally enough.
He is not choosing her over you. He is choosing an escape from his own not-enoughness, and he is using her body and yours to do it. That is not a defense. It is a diagnosis.
The Waltz of Pain That Sets the Stage
Affairs almost never happen inside a bond that is thriving. They happen inside a bond that has been slowly caught in what I call the Waltz of Pain, the pursue-withdraw cycle that eats most long marriages alive.
Here is how the choreography goes. She feels the distance and reaches for him, often through frustration, because frustration is what protest sounds like when tenderness has stopped working. He feels her reach as pressure, as evidence that he is failing again, and he retreats. She feels his retreat as abandonment and reaches harder. He collapses further inside himself. Neither of them is the villain. The enemy is the loop.
Over years, this loop hollows out the bond from the inside. She feels lonely with him in the room. He feels like he can never get it right. Both of them stop showing up as their full selves because both of them have learned, on a body level, that showing up gets punished.
And then, into this depleted system, someone new appears. A coworker who laughs at his jokes. A woman who does not have a decade of unmet expectations coded into her face. An escape hatch appears at exactly the moment his tolerance for feeling like a failure has hit zero. He walks through the door.
Was the marriage the reason? No. The marriage is not why married men cheat. He is why he cheated. But the depleted system made the door easier to see and easier to open. If you want to understand the whole picture, you have to look at the loop, not just the act. I have written more about this pattern in how to fix a broken relationship, including how to tell the difference between a relationship that is broken and one that is depleted.
The Common Reasons, Named Honestly
When couples ask me directly to name the reasons, here is what I actually see, drawn from years of sitting with the men who did it.
The first is what I have already described. He could not tolerate feeling not good enough, and an affair gave him a temporary fantasy of being acceptable. This is the most common reason by a wide margin.
The second is unresolved wounding from his own childhood. Men who grew up with an emotionally absent father or a mother whose approval was conditional often carry a Time Machine inside their body. When his wife’s face registers disappointment, his physiology does not read it as an adult moment. It reads it as the original wound. He reaches for anyone who will not activate that wound.
The third is the trance of what I call the Representative. Early in an affair, the affair partner is showing him only her highlight reel, and he is showing her only his. Neither of them is being a full human being with the other. He mistakes this Representative-to-Representative dynamic for a soul connection, because his own marriage has moved past the Representative phase and into the difficulty of two full people trying to survive real life together.
The fourth is a straightforward failure of interior sovereignty. He never developed the internal ground to stay present with hard feelings, so he outsourced settling his body to whoever was willing to make him feel good in the moment. Alcohol does this. Porn does this. And affairs do this.
The fifth, and I want to name this clearly, is that some men do have character problems that go beyond attachment wounding. If he shows a persistent pattern of cruelty, contempt, refusal to take responsibility, or coercive control, you are not caught in the dance I described above. You are in something else. Am I in a toxic relationship may be a more useful starting point for you than this one.
Most men on my couch are in reasons one through four. A small minority are in five. It matters which one you are dealing with, because the repair protocol is radically different.
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The Eye Roll of the Damned
Let me tell you what I see two years after the affair, because you should know what you are walking into if you choose to stay.
A couple comes in. They think they are fine. They rebuilt. He is remorseful. She has done the work. But every few weeks they have a massive blowout. She gets triggered by something small. He is late coming home. He turns his phone screen down on the table. Suddenly she is back in the trauma, the splinter of the betrayal moving inside her body, and she is asking the questions again. Who was she. When did it start. Did you love her.
And he rolls his eyes. He sighs. He slumps in the chair and says, “Are we doing this again? I have apologized a thousand times.”
To her, that eye roll is proof that he never cared. That he is fundamentally dismissive. That she married the wrong man.
But when I slow the tape down in the room, I see something else entirely. I see a man who is terrified. When she brings up the affair, his body does not hear a wife trying to find her way back to safety. It hears, “you are bad, you will always be bad, no matter what you do, you will never be free of this.” The eye roll is not arrogance. It is despair. It is the collapse of a man who feels he is serving a life sentence with no possibility of parole.
Meanwhile, she is not trying to punish him. She just felt a spike of danger in her body and she is reaching for him to see if he is still there, if it is safe, if she is not crazy for still hurting this much. When he rolls his eyes, her safety evaporates and she gets louder, because now she has to make him feel it so she knows she is not alone in it.
Both of them are hurting. Both are reacting in ways that guarantee the other one feels worse. Their protector parts are running the show and their adult selves are nowhere near the room. This is why so many post-affair marriages die two or three years later, long after everyone assumed they had made it. The affair was the wound. The unhealed dance around the wound is what finishes them off.
What Actually Repairs This
You cannot repair an affair by communicating better. When the bond is that threatened, the parts of the brain responsible for reflection and empathy are simply not online. Both of you are running survival programs. Talking louder does not help.
In my normal work with couples, I hold that there are no bad guys, that both partners are hurting and both are reacting inside a shared system. But after an affair, we have to pause that framing. In the moment of betrayal, the injury is not symmetrical. One person dropped a bomb. The other person was standing in the explosion. So for a season, the traffic has to flow one way. I call it one-way repair.
Before anything else, the third party has to be completely, unambiguously gone. Not “I’m ending it.” Ended. No contact. Full transparency on devices. If he cannot do that, there is nothing to repair yet, and any attempt to work on the marriage is theater.
Then he has to do something most men in this position resist with their whole body. He has to stay present in her pain without collapsing, without defending, without rushing her toward “moving on.” Every time she brings it up, and she will bring it up for years, he has to be able to say, in some form, “I did this to you. I understand why you are asking. I am here. I am not going anywhere.” Not once. A thousand times. That is the actual repeated effort repair requires.
Underneath that, he has to do his own interior work on the not-good-enough wound that made him vulnerable to the affair in the first place. Because if he does not, the same wound will find a new door. Maybe not another woman. Maybe alcohol, maybe overwork, maybe a slow emotional withdrawal that leaves you married to a ghost. The affair was a symptom. If the wound is not touched, the symptom rotates.
And you, if you stay, have your own work. Not because you caused this. You did not. But your body now carries an injury it did not have before, and the way it reacts to any hint of danger will be louder and faster than it used to be. That is not a character flaw. That is trauma. It is also workable. I have written more about how old wounds run adult love in relationship red flags versus anxiety, which may help you tell the difference between a real signal and a triggered echo.
If you want to name where you and your partner sit inside this dynamic before you decide anything, you can take the free Figs Quiz.
The Shift I Want You to Leave With
If you take one thing from this, take this. The question “why did he do this to me” has an answer, and the answer is not that he did it to you. He did it to escape himself, and you were the collateral damage of a wound he never faced. That does not make it okay. It does not obligate you to stay. It does not make the vertigo in your body less real.
But it does change what you are deciding. You are not deciding whether to forgive a monster. You are deciding whether the specific human being you married is willing to face the wound underneath what he did, and whether you have the ground inside yourself to walk through the repair without losing yourself. Those are different questions than the internet is asking you, and they are the right ones.
Common Questions
Do most married men who cheat leave their wives for the affair partner?
No. In my clinical experience, the vast majority do not. The affair partner represents an escape from feeling not good enough, not a real bid for a new life. Once the fantasy meets the weight of actual daily life, the Representative fades and the same wounds return. Most affairs collapse under their own weight within a year or two.
Is he cheating because he is not attracted to me anymore?
Almost never. Affairs are far more often about his relationship with himself than his physical attraction to you. Men who feel like chronic disappointments in a marriage reach for anywhere they can feel wanted, and that reach has almost nothing to do with your body. The sexual aliveness of an affair is fueled by fantasy and novelty, not by his rejection of you.
Can a marriage actually recover from an affair, or is it always the end?
Marriages can genuinely recover, and I have watched it happen many times, but only when three things are true. He fully ends the affair with no contact. He can stay present in your pain without collapsing into defensiveness. And he does the interior work on the wound that made him vulnerable. Without all three, you get a fragile peace that breaks two years later.
Why does he get angry when I bring up the affair, even though he was the one who did it?
His anger is almost always despair wearing armor. When you bring it up, his body hears “you are unforgivable, you will never be free of this.” He is not defending the affair. He is collapsing under the weight of a shame he has no idea how to metabolize. It looks like arrogance. It is actually a man drowning in his own not-enoughness.
Should I stay or leave after infidelity?
I cannot answer that for you, but I can tell you the question underneath the question. It is not whether he did something unforgivable. It is whether he is willing to do the work of repair and whether you have the interior ground to walk through it without abandoning yourself. If he refuses the work, the answer becomes clearer. If he genuinely enters it, staying is a real option, not a compromise.
This is not a you problem or a them problem
“To step out of this cycle, couples must break the Versus Illusion and recognize the system itself as their common enemy. This is achieved when both partners accept the systemic truth: we are both hurting, we are both reacting, and it is only happening because we are so important to each other.”
“Neither partner is the villain. They are two younger selves inside adult bodies trying to stay safe in the only ways they once knew.”
Figs O’Sullivan, LMFT
What to Do Next
Do not just close the tab on this.
Bring what surfaced here into a real conversation. Figlet coaches you through it, grounded in Figs O’Sullivan’s work, LMFT. Free to start.
You did not cause this. And you cannot fix it alone. What you can do is stop asking why he chose her, and start asking whether he is willing to face what he chose to escape. That answer will tell you what to do next.
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