Have you ever been betrayed by a friend?

OMG THAT IS HORRIBLE ! i have had a friend like that but we ended up in a fist fight. i won of course :) but she started a rumor that i was a and turned everyone against me. but i let her have it when she ended up in an ambulance on her way to the hospital to get 7 stitches across her cheek and i ended up with a small, barely noticable sc on my thumb.