From my experience in this, in most cases if you suspect she is foolin around on ya she is, or is at least thinkig about it. My ex was banging my roomate lol and I had no clue until I came home from work out of town 2 days early lol... Trust me you DON'T want to put yourself in that position, because once you beat the crap outta your buddy, then you get to go to jail and pay for a lawyer, then pay a $ 2500.00 fine + court costs, and then you get to work outside for 140 hours doin community service and then probation for 2 years lol... Its better to just dump the dumb broad and find ya another 1, they come a dime a dozen you know.... And that IS a definate Guy Code violation committed by your friend, you should really call him out on it... You just don't talk to another mans wife / gf unless he is around, definate violation