My Best Friend ended our 12 year friendship!! help!! advice!!?

im going to try make long story short, Iv had my bestfriend since we were 14 years old and now were going on 25yrs old so almost 11 years of friendship , and it breaks my heart how she ended our friendship over a lie her physco boyfried made up about me because he hates me and he hates the fact that were friends and we are really close,, he said that i supposably told him something about her that no one else would of known about, which was a few months ago she went out w some guy to a rave , and some how her physco boyfriend found out and he told her that i was the one that told him!! i would never do such a thing! and she eventually she believed him and it totally breaks my heart because shes suppose to be my BF suppose to trust eachother and never let a guy get between our friendship, so she text me saying not to hit her up anymore and that im lucky that shes not like me and that she has soo much dirt on me and that i better be carefull and watch what i say about her,.. i just cant believe and understand how she can believe him before me, her bf is super obsessed with her hes totally physco, i just dont know what to do i guess shes not the good friend i thought she was and i guess theres no need to have people like that in ours lives, which still hurts me terribly because i dobt deserve this , i never did anything to her and theres no way of her believing me =-(