sooooo one of the girls in my friend ( i'm not too close with her but one of my close friends is) group cheated on her boyfriend with my best friend. and because this (dumbass) dude is my best friend i'm not gonna be the one to tell tattle on him and tell her boyfriend. BUT i have a big mouth and i feel like the whole situation is dumb so i asked my friend what to do and she told me she's decided that she's gonna tell him about it. but then i tried telling her we should just confront her about it. she's been telling my friend (the guy she cheated on her boyfriend with) that she's been meaning to break up with him but still has yet to. he believes that he isn't the only guy she's done this with and she still continues to lead her boyfriend on to think she's still into him. (it's incredibly annoying). so i really have no idea what to do about it. her boyfriend should know the truth but i don't want my friend to get yelled at for it ://