But see a guy can be with a girl and not feel crap for her(sorry ladies but it is true) where girls have to like a guy at least some to do him) And us guys know that and that is why it bothers us more.
Some guys cheat because of different reason. Such as bored sexually, deprived of sex from spouse, middle age crazy(just to see if chicks still find them attractive or they just want some strange. Listen, I am not saying this is right. I mean if a good looking I mean goodlooking girl came on to me hard, it would be tempting but I would still try to RUN away because walking won't cut it in that situation. Because I don't want to mess up the relationship with my wife.