Who's the toxic friend ???

So (I'm a girl) I've been friend with this girl for 8 years, I've always been there for her, be the best friend we could have. I'm the type of person that don't like having attention, is super loyal,shy and the innocent one. She's the kind of person that have a big mouth and don't mind to embarrass you in front of everyone, love and have all the attention. And since high school me and her boyfriend we're friends(we met him at the same time)but now we're kind of getting closer but not in this way in the way that we have fun together but not alone, we talk about shit but nothing more at the beginning she was very happy like her two best friends are friends. It grows more and then she wanted us(me and him) to do more things together like going to a concert just the two of us, even if the show was cool I said no that's too much I'll never do that, but she insist more and more like she wants it, still I didn't went. But now, the situation as grown more, she don't talk to me I tried to talk but she said that I was overthinking and that she was cold because I was,BUT I AM BECAUSE YOU LOOK AT ME LIKE YOU WANT TO KILL ME. So I gave up and she didn't talk to me for a mont. Ohhh and she's mad at me but not her boyfriend. So what should I do give up frl or run after her ?