Just lost...

My "best friend" cheated on her boyfriend with the one person I told her to stay away from. She made me promise not to tell anyone about it, but her boyfriend really deserves to know. I've talked her into telling him herself. Hopefully she actually listens to me this time. If she doesn't I'm going to tell him. She's cheated on him before, and he really deserves someone that is more compatible with him. They have their problems and their relationship is going nowhere. They've been steadily getting worse and worse and it really just needs to end. She's been stringing him along for far too long. The relationship might as well already be over, she's obviously done with it... Oh well... I can't do anything about it for the time being. Just wish she would listen to me...