My boyfriend's best friend came on to me so heavily, and I actually really cared about him and ended up cheating on my boyfriend, then trying to have a relationship with the new guy (admitting it and breaking it off with the boyfriend before) but he turned out to be as shitty as one might expect, fucking his best friend's girl.

Thank the gods my old boyfriend took me back. I haven't forgiven myself for it and I know I shouldn't, but it makes me EXTREMELY grateful for loving, forgiving hearts.