Supposed to be my friend but more of a turncoat

I have a friend whom I have been hanging out with for over 2/3 years may be more now but always insisted that I went to hers for tea and chats ,she would call her other friends names to me plan evil revenge or tell me what she would like to do to them , but the next I knew she would be out at these peoples homes being nice, now I'm not in the least Nieve and know exactly what's going on and that she is being more than two faced,backstabbing, drama queen ,I never tell her too much personal stuff cos I really don't think it's her business to be honest,she has become Jekyll and Hyde don't no what to think any more .

Noha, choose your friends that live up to your standards and values. Discard those who try to get close to you to use you as a 'weapon' to denigrate other people. This is why she always insists that you are on HER 'turf' for tea and chats. You can be assured that your friend is backstabbing you to others as well, even though you don't open up to her. People like her lead shallow, irresponsible lives and are among the saddest individuals of all of us. Confront her and tell her she and her actions are disrespecting you. Move on from her and you will find life a lot easier and more comfortable than you are experiencing now.