She doesn't get it. How do I tell her?

So, I'm 16 and my bi sexual friend came out to me 3 weeks ago. I had no problem with her being bi, because I have tons of gay guy friends. She told me she liked me, so I told her I'm straight and didn't like her, but now she's like being weird. She'll text me little <3 and she'll tell me she loves me. Then on facebook she tagged me in a post telling me she loved me. Now everybody thinks I'm a lesbian. Two nights ago she sent me a relationship thing on facebook and when I rejected it, SHE CAME TO MY HOUSE AND KNOCKED ON MY EFFING WINDOW AND TOLD ME THAT WE WERE GOING TO SEE A MOVIE. Just last night she keeps sending me messages on facebook about how she loves me and wants to have s3x. Her first message literally said "I want our 1st time to b special <33" Then She thinks where in a relationship or something. Then today, I was at the mall with my boyfriend, and somehow she found me and came up to me and kissed me!!!! My boyfriend is all totally freak outed by this and won't talk to me. I deleted her off facebook and tried to tell her that I didn't like her nor could I ever like her. I want to be her friend, but I don't want to be her girlfriend. How can I tell her this?? Thanks xoxo