Is this just an excuse? Does he just not like me?

I’m 24F He is 26M

We matched on tinder in early December and a month later we went on three dates in the first week, and then agreed to slow it down. But instead of slowing down we had sex and then got scared of how serious we felt so soon?

The second time we hung out I told him I had sexual trauma just in case I had a flashback and he was really understanding. He never pushed for anything at all but I’m pretty hyper sexual due to my past. It was actually his idea to wait after he heard that I had been treated like an object so much in my past. We had sleepovers the first two dates but no sex.

On the third “hang” he cooked steak for me and we had sex for the first time on Thursday, then the following Sunday he tells me he’s super into me but not ready for something serious because he still thinks about his ex and doesn’t feel like that would be fair to me

He said “really helped him get over her” lol they dated for 4 years??... and sounds like he’s not actually over her..

I told him that I can’t be “just friends” right now because that would hurt me. I told him right off the bat that I didn’t want a FWB and that if we had sex I would wind up having feelings for him