My best friend hates me. what do I do?

first time i met her, she was immedietly my best friend. We even got matching earrings after class cause I guess we just loved each others company that much. Then we started inviting other people to our group, and that's when everything started getting funky. All of them, well most of them, were mainly..promiscuous, but I didn't really mind that, seeing as I loved them anyway, then one day, most of the guys they liked were unexpectedly the boys I was also really close to. So on and so forth, they got jealous of me, even though there was really nothing to be jealous about! and started spreading rumors about me all over school. About me being the promiscuous one, and not them and that I had sex with so one and so forth, when actually, I am one of the 2 virgins in the group. they confronted me and i stated my point and they stopped bothering me. THEY REALY HURT ME but I accepted them again. pretty stupid right. So I became best friends with my friend again. until I notice she was starting to abandon me again like the last time, and figuring that she was really sensitive I figured she was mad, so I asked certain people if she was. being tactless as I am I asked most of our classmates, since she also was quite social. then suddenly for no reason she gets pissed at me, for "making" false stories about me and her fighting. I get pissed also seeing as she misunderstood my words. I was merely asking, and never said anything like that. She starts treating me like crap again, so I fought fire with fire thinking this was just one of those petty fights bestfriends usually do, I didnt think it a big deal! but being tactless as I am I told a lot of people about our problem. she got pissed even more because I told everyone about our problem, which still shouldnt be much of a problem since I didn't say anything nasty about her though I would admit I may have contributed to our demise, then I try to confront her so I can say sorry! she either says later (a.k.a NEVER) or she'd avoid me. In the long run I do get to talk to her but she says she doesn't wanna be friends with me anymore, and as I apologize, and she apologizes as well the conversation ends with me finding out that "her" friends (some of our old group mates) were bickering with laughter the whole time they were eavesdropping on us..embarassing right. she was even half smiling the whole way, then after, I cried my eyes out. until now (all this happened the previous school year) I always try to be the better person, but its just hard to listen to her loud voice in class or even see her. I admit I'm quite paranoid now. what should I do..:(