What do you about backstabbing friends?

Question by <3 MuNcHy <3: What do you about backstabbing friends?
My man and I were renting a room from my mother when my “pregnant,” ‘cancer-ridden,” “abused” and “neglected” best friend came to stay with us. I’ve heard her sob-story four times before: “I had a miscarriage because my dad beat me and I can’t afford my cancer medication.” Well, it was the same when she came to my house. My mother asked if she was staying and she told my mother yes. I couldn’t afford extra rent and my mother didn’t want her there at all. So we made plans to move to Virginia with her. I put in notice at my work, secured a transfer, and we had a place to stay. Said best friend then proceeds to ring my fiance and I dry with her smoking habits and her need for clothes. Fine, she’s upset and needs us. But when my fiance had no more money, she all of a sudden hated him. She was so hell bent on me leaving him. Well, my mother and I got into a fight (most over said friend) and my mother asked me to leave. My brother in law and my fiance (along with my fiance’s best friend) came to get me and said friend. When we got to their house, we got pretty hammered and I started to hear a whole bunch of lies. My friend kept telling me her man was cheating on her and that her niece called her. None of which happened and I knew it. She then starts telling this story to my in laws who are amazingly awesome and sweet people. My brother in law and my said friend start sleeping together. I found out the lies and confronted her, she blew up and named me a bad person. Fiance and I finished the move to Virginia. When I had healed enough to come back home (and said friend was away from my in laws), we moved back. Fiance’s family still believes all of said friend’s lies and I just don’t have the energy to fight anymore. What do I do?

Best answer:

Answer by gratefully_bj
I hope everyone involved uses bc so there won’t be anymore

Know better? Leave your own answer in the comments!