My response was to laugh at him because it was stupid and ridiculous. I literally laughed right in his face.
That is actually the response of an integrated person. The partner says that to hurt. It's funny or you blow it up to even more ridiculous levels.
They want to hurt you and they come out as clowns. Disarming.
@OP - My friend, she is testing your boundaries.
She expect you to be reactive, this way she knows you still care, and she has power to control your emotional peace.
She is dysregulated and not yet stable enough, so her old patterns are using both the emotional load of the affair and a stab to your bond to destabilize you. And it worked in this case.
Read the 1stWife's response, it is really the key. Once you see the game for what it is, it becomes seriously 'funny'. Oh and believe me, she will respect that.
I don’t know about you, but growing up, the constant message I got was to screw every woman I possibly could. And marriage doesn’t change that. For a husband to cheat is common, almost expected, and no big deal.
That's a negative message portrayed in our culture and not at all reflecting the truth. If you had cheater in the family growing up you felt instinctive suspicion and a pinch of disgust, because is bad, humanly bad.
I don't know, my look on another man who can betray the person he should care for the most, is of distance and alert. If he can betray his woman, he can betray anyone. Definitively to keep an eye on him or better yet, exclude him from your inner circle.
You may understand and kind of forgive one who slipped and regrets his choices, not condone, not expect it. Someone who does it with fun and pleasure is definitively a red flag for men and women alike (tell me would you let such guy in proximity of your woman? Exactly).
Women, I think, get a very different message. They are taught from childhood to protect their virtue. Not many women grow up expecting, or wanting, to be an adulteress, the other woman, a home wrecker, a side piece (do we even have those words for cheating men?).
So when it happens, for many women it is traumatic.
Again we are both victim of stereotypes and social expectation, who play a role in stupid behaviors.
What is taught to you growing up most often conflict with your nature and emotions.
Did we forget when we were teenager the rebellion and bs (not as betrayed spouse as in bull...t) we had fun to do?
Women like men have their own wild side and the need to feel alive, because performing the "good girl" or "good boy" is exhausting for everyone.
When you have deeper underlying issues like low self worth and avoidance, you may feel that pressure heavier than average, subfocating, and you may perhaps at some point explode and become a WS, not because you hate your spouse but because you followed the "social script" to the letter and never let go, and you are now life long committed.
Becoming a "bad boy" or a "bad girl" then is the worst possible moment, but I get the repressed emotional turmoil might make it extremely exciting and completely irrational.
(This is my interpretation I don't have it backed up by research, only makes sense to me)