Friend, boyfriend, drama-what now?

I am in this huge fight with my friend. Rumors fly that i flirt with her boyfriend. It is not true! He asked me out last year, and I said no. My friend keeps sending me hate messages like "DON'T TALK 2 ME" and "I WILL MAKE YOUR YEAR A LIVING H*LL!!!" I have tried everything and she is not talking to me, and won't respond to me trying to fix things. All I get is a voicemail of her screaming my name! I know, wtf!!! We are in the same homeroom and I am scared to death to go to school, I start next Monday. I even tried talking to her boyfriend and he knows about it all and is on vacation and said he has to talk to me. My semi-crush/boyfriend thinks I like her boyfriend, and I don't. I like MY boyfriend. What do I do? Thanks.