Two situations would need to exist:
He did not know she was my wife ... ie she lied and he is just doing his thang with a single woman.
He did know she was my wife and is doing my thang.
I am now single because of this situation. My ex screwed around a couple of times. 1st time I beat the shit outta the dude and left him in the trunk of his car ... he knew he was messing with my wife. Even talked smack to me on the phone. I followed her, got his plate, had it ran and followed him from his house. Hit his car in the ass, then kicked his ass when he got out to see who hit his car.
Second time the dude had no idea he was nailing a married woman ... I believed him and I let him walk. I found who he was, went to his regular bar and chated with him like just another beer drinking mofo ... he had no idea he was speaking to the man married to "his" girl. He never spoke to her again after I told him who I was according to both her cell phone and our house phone bills. Soon as he knew he bailed. Smart guy.
End result in my mind? If he knows he gets a beat down ... a real bone breaking beat down. The kind that a guy never forgets. If he does not know he should get a pass.
Either way I will not ever again give a second chance to a cheater.
My ex is the mother of my son so I tried again ... but now I am single.
In no way will I ever knowingly do another man's woman. It's not about her ... it's about me and him. I want men to respect my rights so I respect theirs. If you'd asked me that when I was 20 I would have just snickered and said "Ohhh no ... 'course not" with a

smile.