An enemy won't leave me alone & keeps talking bad about me to everyone?

I was best friends with a girl in high school for many years. we are now enemies. she hates me because I wouldn't help her with homecoming once and was mad that I started getting new friends or something. its been an on going thing with her. I graduated 2 years ago and she keeps finding ways to "get to" me. I could care less about her and I feel that she's not worth my time and me getting upset, but its starting to get ridiculous. she constantly was leaving comments about me, on our mutual friends myspace. saying how much she hates me and stuff. she left like 10 comments. our mutual friend deleted her myspace I guess because she doesn't like myspace and now uses facebook. my enemy has already left a comment about me. she said stuff about how much she hates me again. I finally wrote a comment saying that certain people on her myspace were lame and immature. and my enemy wrong another comment saying that she could kick my a** and whole bunch of mean stuff like cussing me out. then I guess my friend said something to her because she wrote again saying sorry for putting her in the middle of it. what should I do? I've only said something once and she like exploded. I didn't say anything for so long because my boyfriend said not to bother and not to waste my time. but I feel like by me not saying anything, she's feeling like I'm scared of her or something, and I'm not. should I write a message to my friend telling her I'm not going to comment her anymore because of the constant things written about me? what should I do? she won't stop talking about me to everyone.
An enemy won't leave me alone & keeps talking bad about me to everyone?
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