I just want some advice and want to get it off my chest.

Background: Known this girl for 12 years, since elementary school. She really liked me for a long time, up until a few months ago when she finally got a boyfriend. I never acted on her interest because she was clingy and a little annoying. We hung out a lot during the end of high school (2010) and up until now with my other best friend, a male. We (my friend and the girl) starting hanging out less because of college and she has some fairy ass boyfriend now. (Ive never said this about him in real life, just here lol)

Anyway, my best friend and I have been hanging out a lot (4-5x week) like we usually do and we haven't spoken to the girl in a little under a month. She hits him up today and asks if she can hang with him, they hang out and my friend tells me a few things she said about me.

This seems to have came out of the blue, but she claims I'm a bad friend and I "twist her words and I'm nosy" and started talking some shit about me, she then tells my best friend to just wait and see how bad of a friend I am and she doesnt want to hang with me anymore (I've been friends with my best friend for 6 years, I think I'm a great friend.) He disagrees and has my back, obviously.

Anyway, I'm a little shocked at this because I honestly cant remember anything I've done that would make me a "bad" friend. Yes I've annoyed her and gotten her mad a couple times with my jokes and sarcastic personality and stuff, but thats how I am! Doesnt seem like that would make me a bad friend. Honestly the amount of times ive shown her a good time, made her laugh her ass off and was generally cool severely outweighs the one or two times ive gotten her mad/annoyed. Nobody else complains, I'm generally liked by people.

So a part of me wants to fix things because shes a long time friend and shes fun to chill with and stuff. But a part of me wants to say "fuck you" and if you don't want to be my friend then I'll stop talking to you, that's what she wanted right? Another note, she doesn't know that I know she said these things, my best friend being my bro, told me what she said.

So what do guys? Im kinda mad that she thinks this about me, but its also a weird feeling going from hanging out with this person for a long time to them straight up not liking you anymore

What would you do if you were me?