GIRLS PLZ HELP!!! Does she want to be friends or what...?

i told her i liked her and never made a move. after i told her, she wouldnt talk to me but she would always smile at me whenever i looked at her and this went on for a week, then she completely started ignoring me and would sometimes talk to me, we had a small conversation about this hsitty teacher, and trying to make me jealous by flirting with other guys in front of me, and she randomly had called me by my nickname that she had taken away that month but then stopped becuase i didnt respond surprised. this went on for a month or two. Then we had a group assignment and she kept insisting on me being in her group, and i just joined so that i can finish faster. Then one day, she just messages me that she needed help fixing her phone, which i was foolish enough to do, then the next day she was kissing this guy in front of me with no regard that i was there and she knew she was hurting me and they werent even goin out yet, then she just comes up to me all nice and crap and talks about how her phone was broken and was all nice to me, and she would call me by my nickname that she had given me and would be the only person to call me that but had taken it away during that month, then she would try to talk to me when she needed help on her test, yes i kno i was being used, by rubbing her hand all the way down my arm, then she moved to the seat in front of me and started stretching back and putting her hair in my face, then she kept trying to get answers again, but then i would ignore her and she would get mad and threatened to delete me from her blackberry messenger. then the next time i saw her, they we're officially going out, and then she started giving me the cold shoulder again and only talked to me when she needed me...what does she want plz help!!! Then, on the second to last day of school, we kept catchin eachother's eyes for like a second then she just held it and gave me a wass nod and i returned it and we kept nodding back and forth. Then i put up my phone for sale, and she is in love with it, and she just texts 'gimme ur bold <3' as if we were bestfriends...then on the last day of school, the only thing she said was 'wassup jorge' and i replied like a normal person would...'hey'. she never brought up the message, but could she be pissed at that, we're both 15...