Answer There are times when we want to tell others about things we know, but in telling that person we do two things. We upset any happiness that they share, and we don't know the real reasons behind his having an affair. We stick our noses where they aren't welcome so I'd butt out if I were you and let nature take it's natural course. If the other one finds out, don't let it be through you. You could loose a good friend trying to be a friend.