Girl help high school freshmen?

Ok I really love this girl..she's a freshman and she is dating someone but looks like their going to break up soon...I talk with her and stuff and it appears to go well then she makes fun of me spreads rumors that I'm gay or bi..says I'm bipolar and stuff and it hurts cause I think she likes me then that happens and right when I give up love for her she says I'm a keeper and she loves my eyes sometimes get real close to me..then I love her all over again..now recently she became mad at me and she won't tell me y.but continued to joke about me but I catch her staring at me..I called her asking her if we were still friends and wats going on she says we aren't friends we nvr were and I said u broke my heart too many times.. y..she said too bad gotta go bye..I'm sooo confused what do I do it's ruining my relations wit my friends an family cause I'm always thiking where did I go wrong and stuff ..please help..