Give it a rest, guys.
Doesn't matter how "in love" you are, a real man will always wanna bang different pussy. The difference is, a man in love will avoid doing so, because, as someone else said, he respects his lady. Same thing for the women.
I have never cheated on a girlfriend. I choose to be with that girl because I respect her, otherwise she's just a fuck partner. Now, if she goes out on me, I have to re-think my respect for her and come to the conclusion that she is a worthless whore who doesn't deserve my respect and loyalty.