Girl (25F) I (24M) have been seeing started sobbing about her ex during sex and I’m not sure what to do now

We’ve been seeing each other just over a month. We really hit it off on the first date and have been seeing each other multiple times a week since. Last night, I picked her up from work and we went back to my place. We were laying in bed cuddling and watching TV when she started to play with herself, and it eventually turned into sex… sort of. We were going for all of 30 seconds when she suddenly started sobbing. I immediately pulled out, hugged her and asked what was wrong. She said that she wasn’t over her ex (who she had previously told me abused her and she was terrified of) and wasn’t ready to do this yet. I told her I was there for her and asked if there was anything I could do, and she asked me to drive her home, which I did. She hasn’t answered her phone at all today and I’m not sure if there’s anything I can or should do, or if this is even still a relationship anymore. Where do I go from here?

TL;DR: Girlfriend started sobbing about her ex during sex, hasn’t talked to me since.