I think my fuck buddy is catching feelings and now I'm feeling depressed I can't return them

We have great and amazing sex. We talk often as well and get along great but he confessed to me today he really wants more and he is falling for me. But as much as I like him and as much as I know he'd be a great boyfriend, I'm not in the right place to be in a relationship. The two ltr relationships I had left me messed up for a while after they ended and I just don't know if I can go through that again. I feel really bad about probably having to discontinue our rendezvous because he really is a great guy. I just don't think I can be vulnerable with anyone for a while and now it's getting me depressed realizing this.