BFF Trouble...

I just told my (ex) BFF i don't wanna be her friend anymore. We've been BFFs since pre-school (we r now in middle school). We did everything together. I practicly lived at her house. But this past summer she has been trying to steal my friends, she mite say she isn't but, it seemed like it. And my other BFF noticed. I came up to her and told her when she waz leaving her cheerleading prcatice, than had to leave. She waz walking with my best guy friend Kevin's twin sister Kisha and Kisha hates me. And Nichole (my ex-BFF) has been hanging with Kisha alot. But that's another story. Also she's coming to my bbq this Saturday. It's gonna be hard. Wat should I do about both problems? Do u think I waz rite to do that? PLZ HELP!!!!!!!!!!!!!