Friendship trouble!!?

I have been friends with her for 5yrs, and i love her n do anything for her. but shes been dating 4 guys at once and i became really good friends with one of them (plus in dating his best friend), and my best friend and him have been datin 4 a year, she hasn't talked to me in 3 months, so i told him everything shes been doing, cheating on him with 3 other guys plus shes not a virgin anymore. and he cant get a hold of her to break up with her, plus she might hate me for telling him everything???? what do i do??