Sadguy,
All to follow is based on my experience, reading, and what my cheating wife has told me (which perhaps shouldn’t be believed). And thus may only apply to me and not a single other person on planet Earth.
Imagine with me, if you will, an attractive co-worker. You two have worked together for a while now, and have come to know each other, a little bit. You like her, and think she likes you.
But one day, unexpectedly and while no one is around, she comes up behind you, puts her arms around you, presses against you, and whispers in your ear, "Let’s get lunch." You feel her breasts smooshed against you, her warmth.
What happens?
Well, if you’re me, it’s an immediate erection. Does this mean I’m going to have sex with her, I want to have sex with her, I’ve been thinking about having sex with her, fantasizing about her?
It might mean all of those things. But it might mean none of them.
I figure I’ve had about 100,000 erections in my life. I’ve had sex maybe 2,000 times. This means my penis has gotten it wrong, been overly optimistic, 98% of the time. 98%! You’d think the thing would learn. It must be terribly disappointed with the rest of me; just can’t close the deal.
Why does a woman’s breasts against me trigger an erection, desire, arousal? I don’t know; it’s just the way I’m wired.
But in my example, while the little head down there is all in, the big head, on top of my shoulders, is in conflict.
The reptilian part of my brain (the majority of it, I suspect) is yelling, "Do it, Do it, Do it."
But what I’ll call the intelligent part of my brain (a tiny bit, I’m afraid), my character, morals, integrity, honesty, will power, love for my wife, is also yelling, "No way."
And the intelligent part wins. I tell her, "Thanks, but no thanks." And I start thinking about limiting my contact with her.
I think an analogous thing happens with some women. When they sense they are desired, are being hunted, the equivalent of an erection happens, arousal, and desire. And the same battle between the reptilian and intelligent parts of their brain occurs.
In your wife’s case, the reptilian prevailed. The dopamine shots were too great for the intelligence to overcome.
Was that because her character is weak? Was it because her dna wired her for huge dopamine shots? Who knows.
Now, the aftermath.
There are two important questions.
The first is, how do you feel safe with her going forward. You don’t want to live your life worrying she’ll do this again, that she’ll leave you, wondering why she’s late from work, nervous when she goes to lunch with the girls.
Number one, she has to get away from the dopamine shots; she has to get away from this man who is hunting her. New job, absolutely no contact of any type.
And she has to avoid dopamine shots in the future. You already know which side of her brain wins that battle. This means limited contact with other men. No lunches with colleagues. No chatting with the neighbor, or the little league coach. She won’t like this, it’s demeaning, but it has to be.
Number two, maybe she can strengthen the intelligent side. Maybe this experience, seeing the consequences of her cheating, what she might be losing, will do that. Maybe therapy, to find and repair the holes in her psyche.
And the second important question; the tough one.
I said above that one of the factors that would strengthen the intelligent side of my brain, was love for my wife.
But I wonder why my wife didn’t have enough love for me to resist. And maybe you wonder that about your wife.
A lot of experts say that cheating wives are more likely to have left the relationship, and they often don’t come back. They blame their husbands for forcing them to cheat by not meeting their physical or emotional needs. And they despise their husbands for this. No one wants to be the villain in their own story.
They may physically stay, for the kids, finances, security, religion, reputation etc., but not for love.
Having said all that, there are examples of cheating wives who have reconciled on this site.
But it never happened for my wife and I.
Best wishes.