Ok guys, this has turned into a serious problem. My closest friend, we'll call him Sam, has been dating this chick we'll call her Kristen for a year and a half now. He is way up her ass but I'm okay with that cause he generally still knows how to go out and have a good time without her. Anyhow, I've just recently discovered that she has made out with two other guys while they've been together and been having sex with another guy throughout most of their relationship. I definately think I'm obligated to tell him this. It came straight from her mouth, I'm pretty good friends with her as well. Or at least I was til I found this out. Guys, how do I tell him that his girl who he's put so much into has been cheating him blind for most of the relationship? Please help. If you've had to deal with this situation please tell me what you did. Even if you've never had this happen please let me know if you have an opinion. I'm planning to tell him the next time I see him, probably this weekend. I need to know the best ways to approach him and inform him of this. Thanks guys.