<human>: Can you provide a brief overview of the text?

I met my ex right when I moved to my city and anyone I know I met through him. We were pretty co-dependent in addition to the fact that he was emotionally abusive, so I didn't see other people very often. As a result, the few "friends" that I have aren't really friends. We catch up when we see each other, but didn't hang out much and never hung out alone when my ex wasn't there. 

One of them has reached out to hang out, but I don't really have any interest. It'd be nice to have real friends, but honestly, I don't trust her because she's his friend first, and I don't want her reporting back to him or him hearing about me even in passing. I also don't want to run into him and the circles these people run in are TINY. Like if we went out somewhere, there's a 90% chance he'd end up there too. I just don't think it's worth it. 

Is this bitchy? Do I have to say anything or can I just fade away? I was out of town this week and she asked me to let her know when I was back so that we could hang out. I'm worried saying "no, I don't feel comfortable maintaining mutual friends with my ex" is too harsh. Could I just not respond? That feels rude too. Help?
<bot>: Is it okay to cut off mutual friends after a messy breakup? We weren't close to begin with and the cons outweigh the pros of keeping in touch.