Dealing with a toxic pretty girl?

Long story short, I started talking to this girl named A at the mall. My friend knew her first and one day she asked my friend to call me over, so that's how we started talking. At the time, I was already seeing 2-3 other girls and I had to tell her because they would come into my store and A would see them and confront me. So, I told her the truth. Eventually, A and I got really close, always calling and walking with each other in the mall. A is super pretty, probably the prettiest girl I've been with, and I'm pretty insecure, so I was shocked when she asked my friend to call me over. I can tell she really likes me because we argue like we're together, and she told all her coworkers about me. I often see them watching me to make sure I'm not messing with other girls, so it's obvious she talks about me a lot. This morning, she FaceTimed me and started rambling about her ex and how I remind her of him, which isn't the first time. I let her talk for a while, but eventually, I felt dumb listening to the girl I like talk about another guy. So, I told her she shouldn't reminisce about a guy from two years ago, and she got mad and tried to put it on me. She starts saying I'm immature and claims she talks about her ex because she likes me and wants me to know what not to do, which feels like total BS. Then she tries to put me down by saying she's the prettiest girl I've been with and that people have told her she’s too pretty to be with “that.” That kinda hurt, not gonna lie, especially since I'm already insecure. I think she’s saying all this because of the drama with the other girls in the mall, and I admit I sometimes make her look bad since I was seeing multiple girls before her, and they all know about each other. But seriously, does she really mean what she said? She’s the one who wanted me first, so there's no way she doesn’t find me attractive. Should I talk to her about this in person later? there's more to the story but i can't fit everything
Dealing with a toxic pretty girl?
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