Basically, I went out with this girl for ages, everything was going fine. We both liked each other, I sat next to her in every subject and everything was going smoothly. Or so I thought. Suddenly this new boy came to school (I'm in Year9/8th Grade (I think))and me and him became best friends. But the girl started acting strangely around him and one night on Facebook she was like "he's so cute, I might ask him out", and I asked "but aren't you with me?" and she said "Well, you've been calling me your friend all week, not your girlfriend, so I thought you'd dumped me, and I naturally moved on". After that, apparently she still wanted to be friends with me, so we tried but then that boy said no to her, so she started treating me like crap for apparently splitting up with her.Eventually she started going out with my other best friend and started telling him all my secrets (some of which she made up to get him away from me). Obviously, I talk to my other friends about it and one of them agrees to talk to her about it. 2 days later, she texts me saying "why have you been talking sh*t behind my back?" and we had an argument. Now, we're trying just to be friends again, but she's still saying sh*t about me, telling me about it but not saying what she's actually said and apparently "I need to "chill the f*** out", to various people, I might add, and she's got it into her head that I've been saying things about her. Now that I've talked to her about it, she's gone on a rant at me. At this point I've hung up on her and blocked her, but she's texting me her boyfriends phone, calling me "a p*ssy" for "not facing up to your problems" and calling me two faced and that she's so nice to me and I apparently "give her nothing in return". I'm thinking about putting my foot down and arguing with her about it, but she'll obviously overpower me and make me feel like crap and it will just make her more likely to say stuff about me to my friends. Apparently she's also going to tell MY brother about it and "see what he says about that". What should I do? I would ignore her but she'll probably kick the crap out of me at school (I'm kind of a dweeb).