So my "best friend" is mad at me?

[Jade]

So my friend gets mad at me occasionally (like all friends do) but it's always over the smallest of things, she's never really flipped out completely before. Today however I wake up and my friend is gone from all my social media. Facebook, SnapChat, Instagram, everything. My friend found out that she is mad because she saw some messages of me venting to someone about her and how much she annoyed me because I found out she's a compulsive liar and she's had this massive fake story going for about 3 months. I will admit I said some pretty horrible things and I won't even start to deny responsibility for that but I know she says stuff behind my back all the time to people. She's coming back in to school tomorrow and I've heard she wants to "have a private talk". What should I say to her, how do I save our friendship and most importantly how do I not get really angry and just rage at her?
Thanks
-Jade
Just to be clear these were private messages with me and my friend A about my "best friend". Then another person hacked A's account and sent them to my "best friend". She had no right to do this.
-Jade

[Tim]

With all the bad stuff you vented on her about you still consider her your best friend???? Put yourself in HER place. If YOU read all that would YOU grin and bear it??? I doubt it. Be careful about what you post!!! You can always apologize but don't expect any answers anytime soon, I'd be ticked off too. Better give her some space and time to cool off at least....and stop RANTING on Facebook...anything you write can be cut and pasted and sent TO others! The Social Media World is getting smaller and smaller.

[Inner Universe]

I'll try and answer the questions in the order that you have asked them.
First of all there is no saving this friendship. In my opinion it seems like the two of you just cause each other stress ans that's not healthy. You should remain calm when you guys talk and put all the things she said behind you. Be brave and mature about the situation and understand that in life for true happiness to be obtained sacrifices will have to be made.
I wish the best.