ppl r so confusing

my ex asked me the other day if I wanted to get back together. I told her that if she'd asked me that like 2 or 3 weeks ago then she would have gotten the answer she wanted. It took me months to get over her while she left unaffected. I used to cry every day bc I was scared to lose her and now she noticed that I stopped caring as much and all of a sudden she wants to show me affection again. I started hanging out with someone new and through a lot of discussions I realized that ppl who love u aren't supposed to make you feel like ur not good enough. And if they're not trying to keep u around then they're not a person to keep in ur life. So now she sees me happy and wants to jump back into my life like she never did anything wrong. I said she was just being jealous and that's the only reason she wants me back, I mean she also basically told me to my face that she wanted to use me for sex... She blew up at me after that talking about "I'd never be jealous of any of these whores that u hang out with" which wasn't great. Now I'm jus contemplating whether I should still stay friends with her. ik I make her seem all bad but I don't want to just leave her alone bc I'm the only genuine friend she has and she was the only person who actually supported me when I spoke up after being SAed by another classmate. Wut should I do :(