So what indicated to you that your friend really wasn't a friend?

Thankfully I haven't had much drama since I avoid making friends most of the time. I only axed someone out of my life when:
- The person tried to hurt me. You know, personal attacks and constantly insulting me.
- The person getting jealous when I was with my other friends
- The person trying to turn people against me
- Being two-faced. We all talk about others behind people's back. But it's easy to tell when it isn't a simple gripe/venting.

I probably had it pretty good compared to other people's backstabbings. Share your wisdom.

When I find out they are only using me.
They constantly put our friendship on the line just to get their plans accomplished.

e.g. "If you don't do this, then our friendship is over!"

Talking about me behind my back. I'd rather get stabbed in the front than in the back.