Need help..!! My ex cheated on me

I was in a relationship with this guy for 8 years.I broke up with him in January 2023, because he cheated on me multiple times, I had trust issues, and couldn’t be with someone like him. We didn’t speak to each other for few months. In May he called me back I spoke to him nicely we started seeing each other, but it went for few weeks.

Now coming to this year, 2024 we again started seeing each other. But I told him In April that it’s not working so we shall part or ways, but he begged me to not leave him and cried like I can’t even explain. I gave him a chance thinking there is a chance he must a changed person. We started hanging out, and going on dates, got intimate. But yesterday my friend sent me a picture of him with other girl. This girl posted a picture of them with 🧿♥️ this emoji.

Now I confronted him and he agreed yes he went to meet this girl behind my back as she liked him very much and he also got carried away But they didn’t start dating. and he went to meet her to tell her that there is no future of them. Now this guy is not letting me call her to confront her. I have never done anything like this in my life. But this time I want to ask her what is going on?

What should I do.?