So, at my wedding, one of the groomsmen (who is married but his wife was not able to come to the wedding) was sort-of hitting on one of my BMs. Apparently at the end of the night, the two of them walked home from the after-party together and he was holding her hand. She told me about this and I was like WTF?! She didn't know he was married and was pretty surprised when I told her! Not only that, but he just got married a few months ago! Anyway, I told my fiance about this, and he tried to make excuses like that GM was drunk or whatever. I told my fiance that it would be completely unacceptable for him to EVER do anything like that, and that I would consider it cheating. What do you think? What would you do in that situation (if you were the guy's wife?) Would you consider it cheating, or not a huge deal?