Should I believe my "best friend"?

Am I in the wrong for not knowing if I should believe my "best friend" when she tells people that she was raped? My "bsf" has had a history of lying and overreactive behavior. She has lied ab stuff like how many "bodies" she has, "flexes" how many people she has slept with, ab the drugs she takes, etc. it's been like this since 9th grade. me and a few others who know her agree that she acts very narcissistic and is rude to people. She can be very aggressive for no reason and mean. And now suddenly she has started telling everyone that she's been raped. Problem is that every time she tells someone the story of it, the guy has a different age and it was a different situation, etc. none of her stories line up. One of my friends in my class has found out that my "bsf" since 5th grade has been talking shit ab me to her new classmates. Doesn't help that ive always had a weird gut feeling ab something like this happening. She still randomly acts like we're besties but then acts rude. Idk what to do and if I should believe her or not. My friends are also telling me that I'm being used by her bc of all the stuff I've done for her in the past, but she ignores it and says that I have done nothing for her. She also tried to force me to go out last Thursday when I had to study because I was thinking about buying us Thai food for dinner once I had my first paycheck. I have it now, but learned ab her talking ab me in ways that kinda hurts but now everything adds up. She has even ruined one of her new friendships and has become disliked by people in her new class, who she has very good relationships with supposedly. I just don't understand her and idk whether to believe her or not. Like I wanna believe her but a certain gut feeling tells me not to bc of the stuff I know she's capable of. She told my bfs best friend lies ab me and now my bf isn't friends w that guy anymore bc or everything she has said. He started saying stuff ab me too. I'm happy that I have my bf who believes me and knows me.

My friend has also had a long history of hating my past boyfriends and starting arguments with them ALL THE TIME. she broke up my first friend group that I had for myself too. There is so much I could say but I won't in this post.