i hate my bsfs gf

ok so i have a friend of 6 years, and he recently got a gf. She started off nice, but then my friends started telling me she didnt like me and was slabbering behind my back.I've never met this woman, but shes talking ab me, and i just think maybe shes upset im friends w her bf cause im a girl and she isnt sure ab me, and im not too worried. then i find out not only has she been slabbering to my friends, but has been recieving slabber from my friends about me. She then goes to her bf, and complains abt my friends texting her, and says she dislikes all of them. Then, she blocks me and accuses me of blocking her even though i didnt do anything and i have proof she blocked me. Her bf doesnt believe me, and thinks i blocked her, and she is acting all innocent even though i know she blocked me. I told my friends cause i was unsure what to d, and they were all really mad at her because of it, but have now magically forgiven her? she also tried to break up my friend w her bf but thats a whole other story. I have to hang out w this girl, what do i do?
My friend sees no issue w this either, i've literally offered to stop being friends w him if it would make her happier, but he refuses.