i need best friend advice; she walked out on me.?

Me and my best friend kenner have been having little problems with our friendship. I'm 14 and she's 16, so this isnt a adult friendship. we are just teenagers in highschool that met through soccer and managed to pull out a amazing relationship. she was there for me, and i was there for her completely. well recently i met her best friend whom she calls her"sister"at a basketball game. her"sister"and her have been friends since first grade. her name is kristi and basically kristi thinks i treat kenner like shit. and tells kenner about it. so i told kenner that i didnt like kristi and she's a bitch. it was a wrong move on my account. then she sent me a text saying,"I'm done. If you wanted to be the first person i walk away from then you got it. Congrats. I hope this is what you wanted."im am truely lost. i cant lose kenner, but she says shes done with me,do i respect that, or try my best to get her back and apologize,the awkward part is that she's with kristi right now,and i dont want to apologoze while she's there.what should i do, advice, critism, call me bad names? whatever, i'm freaking out.i dont know how to move on, that wouldnt help. she meant the world to me.

omg im so sorry that sucks I would ask her like on msn or something what you did wrong because seriously if kristi can say mean things about you then why cant you just say i don't like kristi STUPID i would apologize though, not while Kristi's there because she will try to make the decision to accept or not (as far as I can tell) either that or if you have other friends become good friends with them and ditch her like she did with you cause if she meant it then she would stay away from you but if she was supposed to be your friend then she would see the mistake SHE made...not you i tell me bffs every person i don't like even if their friends with them they don't care because its my opinion and i do the same with them now that's how it should go im so sorry once again and good luck