Dealing with Breakup Anxiety and Mutual Friends

Hi there! So, a little over half a year ago I broke up with my ex. The relationship became toxic and worsened my anxiety quite a bit. The breakup was really messy and we have each other blocked now. I’ve made a lot of progress since then, which includes starting medication which has helped me immensely. However, there is one thing that I have been getting anxious over a lot. We met at a college club, and therefore have a bunch of mutual friends. He’s known a bunch of them longer than me. I constantly worry about him shit talking me to them behind my back. I’m worried that I’m gonna lose a bunch of my friendships because of him. I can feel a bigger distance between me and some of them, but we still talk. I always wanted to get closer with them but I have a feeling that it’s impossible now because they’re closer with him. I care about them all and don’t want to lose them, but I’m worried that because I made some mistakes during the relationship, and if they know, they lowkey don’t like me and don’t even want to be friends anymore and are just sticking around out of obligation. I’m worried that I fucked up not just a relationship, but my friendships too. This might just be my anxiety talking, but it keeps bugging me and it’s hard for me to ignore. What do I do?