<human>: First of all, I'm a woman. I don't know what inspired my male friend to confide in me, but he recently told me that while he hasn't had sex with any women except his wife, he has come extremely close to it with a number of women. 

During our conversation, he gushed about his fairly recent college encounter with a woman who was "toned, athletic, beautiful, confident. She had it." They fooled around, but didn't go all the way. He and his wife were dating at this point. When I asked him why he didn't just break up with his then-girlfriend-now-wife so he could pursue other women, he said he didn't want to lose her, but that he "should have dumped her ass." He bragged about how easy it is to hide things from his wife.

I also know that he tried to seduce a mutual friend via email and "hang out secretively." She didn't take him up on his offer, but he was obviously looking to be unfaithful to his wife.

I don't know what to do! Should I describe the conversation and the attempted infidelity to his wife? He obviously doesn't think of his wife as he should. He said that she knows some of his philandering, but not even close to all of it. If he had said she knew more about it, I would ignore the issue and assume she knew what she was doing, as stupid as that may be.

Summarize the given text in a few sentences.
<bot>: My friend doesn't talk about his wife as he should, has essentially cheated on her, and bragged about his infidelity to me. I don't know what to do. Should I leave the issue be or tell his wife?