By "hooked up with" you mean shagged right? So what? If she tops herself it's her problem. He dumped her, there's no relationship between the two of them worst case is she decides to dump you as a friend cause women are weird like that
Well you could tell her about you and Ron, and tell her not to kill her self. But if she does well you tryed to keep her from it but she did it regardless. She obviously has Issuse and needs to get some help for it. But you life shouldn't have to suffer just cause hers does. * I didn't mean anything I said to sound mean or rude, Im sorry if it did.*