How to deal with a best friend break-up?

I know she hasn't said it clearly but she's been threatening to stop being my best friend but never going through with it. she's ignored me and when she doesn't she's yelling at me saying I cause drama and gossip about her where it's the OTHER way around; like for example right after when she said I was gossiping she called up one of my close guy friends to talk s**t about me.





but back to the main point, it just isn't working anymore and we both know that..I've known her since kindergarten and we've been extremely close ever since...I can't believe she just doesn't care about me anymore and also she chose a friend over her bff, that hurts also. what do I do?How to deal with a best friend break-up?
Ive been there so many times and I usually stop talking to them.but i do have a best friends from 2nd grade and we went through the same thing.We fought constantly and rumors were spread.Usually there is an underlying problem that shes not telling you.I think the best thing to do its get straight to the point with her.If she wants to be friends then work it out and put the past behind you.if not then don't stay in a friendship that is only hurting you more in the end. People change and it sucks.You just have to be honest about it.If shes willing to put in as much as you are them im sure things will work out for the best.