So.. my bestfriend is now talking to my ex.. it hurt me so much.. & it still hurts a bit.. my ex & I are close still. we talk all the time in person & over text.. which probably isn't the best idea that I've realized by now.. & two days ago he waned to talk in person, and so we did.. that "talk" wasn't a talk at all.. it was more like making out & a lot of other things.. & he's still talking to my bestfriend (now my ex-bestfriend because I was pissy about her being w my ex..) & I kind of regret doing it but I realized now that he's doing the same thing to her that he did to me when we dated.. Do I tell her it happened? Or what do I do?..