THIS GIRL WONT LEAVE ME THE F@%K ALONE!!?

Ok, my parents are pretty good friends to her parents and the last time I saw this chick was when I was like 9 or 10 and now I'm 15. So one day when I saw her 3 months ago at a concert she told me that she doesn't like me, but she LOVES me... and I was like (In my mind, WTF!??! The last time I saw her was when I was 10?!?!?) So I asked her, "How do you Love me when the last time I saw you was when I was 10?" Her response was " I've had a crush on you for the longest and I really can't control myself...!" So I told her nicely that It'll be cool If we become friends....she didn't take it easy..trust me... It was horrid. So that night I went on facebook and she said that her heart was broken over some stupid **** and most of the comments said that "you're too good 4 him". I HATE ARROGANCE! Anyway, ever since then she's been getting boyfriends and such, but even then she keeps emailing, calling, texting me "hey we should hang out" or "Hi, can you talk". I respect women, but ***** you got a boyfriend talk to him damnit It's been going on for 3 months LEAVE ME ALONE. I try my hardest to avoid her, but she is so persistent! Sometimes I just want to say things that'll make her **** off, but I don't like to hurt feelings because I know what pain feels like and it ain't pretty, but someone HELP PLEASE!!!!!!