My best friend constantly talks about herself and her relationships. She is so selfish and thinks the world revolves around her and her life. How do I tell her that I can't stand it anymore and want to live my own life?

Why don't you just start living your own life so that instead of listening to her stories you have a few of your own to tell. I could be wrong, but maybe that's the real problem here.

I'm doing a relationship Q&A for my next Swear Down TV vid, so if you want my awesome advice ask away....