Should I forgive my friend after she turned on me?

Angry woman being ignored by her friends in the street

DEAR DEIDRE: MY friendship group turned on me, and I felt so hurt, betrayed and angry.

Now one of them wants to be mates again but I don’t know if I can trust her.

I’m 16 and my three friends are too. We’ve hung around together since we started secondary school. 

But a few weeks ago, one of them started chatting about me behind my back, telling lies about what I’d said about her boyfriend.