Friend avoids me for something I did not do?

So about two months ago my friend Cathy started a relationship with a man at work(Tom). It was always just about sex. Then he started showing less interest in her and she started getting very dramatic, crying and stuff, not in front of him mostly by herself. She would text me really dramatic things like "i cant stop crying, why do i keep messing things up" and she asked me to call him because i was his friend as well and see why he was becoming distant. So I did this and he told me he felt she wanted more from him and he could not give that to her. And so he told me instances where he felt uncomfortable and he really opened up to me.It was very clear they agreed their relationship was just about sex, and i told her cathy what he told me because she is my best friend. Then the next day at work I guess Tom did not talk to her much and she thought I must have told him something during our phone conversation that turned him off. So she told a few people that I did damage to their relationship and I am the reason why he backed away from her. Now its been 2 months and we havent hung out. We used to see eachother every weekend. Now she always has an excuse. I never said anything bad about her to tom. She is telling everyone but me..that i am the reason why they did not work out and she wants me to say that im sorry. I am not allowed to tell her though that people are telling me this. She even made me remove him from my facebook, her reasons were she wants to slowely let him in her life and she doesnt want him seeing things she is posting. Some weird bazaar bs. Anyway just to share some lame excuses she has been using to not hang out "my drain is clogged", "i dont feel good", "I bought a dresser and im putting it together that night"...I am always reaching out and she developed some weird hatred in her head with me and I dont know what to do.But she doesnt dare say it to my face. I always try to help her. I brought in her mail for her the other week because she was away on business. Yet she is so shady. Im afraid to say anything to her because she is the type to get dramatic and totally stop talking to me. i am not even sure why I try so hard to not step on her toes, its just we have been best friends for years and i dont want to throw it away.But what she is doing is really weird blaming me for a guy not liking her and not telling me it...and I just dont know what to do. Please help.