How to get a best friend back?

My best friend stopped talking to me and started being a complete **** to me about 9 months ago without reason at all. On my birthday which was three months ago, I had a party, and I invited her and we both got really drunk and she broke down in tears and apologised, and told the whole house how much of a dick she'd been, and how special i was, and how much our friendship meant to her, we were fine for about 2 weeks, not as close as before, but getting on well... and then she starts being a complete **** again. I love her so so so much, and I miss her so so so much, and I've told her, but she says every time "you sound like a lesbian, what're you on about, we are friends" but we're not friends, not really, and I just miss her so much, and what it used to be like, and I know I should just get over it and move on, but it's so hard to see her every day at college and not want to go and hug her, or go and slap her for what she's doing to me. I've tried everything, ignoring her, trying to be mutual, begging her, but it's so hard to see her every day and just pretend we were never friends. I want her back, any advice?