Friend trouble...big drama?

okay so one day i went with some friends to a different school when we had a day off, i met ssome of her friends. two if the guys i met like me. and i like them both back. problem is they do drugs and stuff, but they said they would stop for me, and they did. now another friend...lets call her bob...so bob got mad at me bc i was like texting in cl to these guys. and she told me to chose between being friends with her or being friends with them. i told her i want gonna make that descison, because i dont wanna loose either of them. so she told me she would choose for me, he exact words "fine were nat talking anymore, and you better not talk to me"...last week was the school open house and one of the 2 guys came he heard she was giving me a hard time so he asked her to stop. now shes thretening to tell the principal that i beat herup(not true)this has been going on for 2 weeks, what do i do?(she started a rumor that i was drunk and high at open house,not tue btw) should i let her go???