if the friend that betrayed me was a boy: i'd get back at him and probably take all his friends away from him and make him regret (yes i could be pretty cold hearted when it comes to fellow guys ) if the friend that betrayed me was a girl: i'd probably ask her why she did it, ignore her for a couple of days or weeks then if she regrets what she did i'll make her my friend again see how i treat a dude and a dudette unequally? lol