not feeling the relationship anymore. any insight helps

So I was with my SO 3 years before I got pregnant. When I was 8 weeks we split and I moved closer to my mom which is 2 hours away from where he and I were living. It was a huge decision but honestly the best one I think I've made in a while. Fast forward to 24 weeks. He started showing a lot of interest in the baby and my pregnancy. But between 8 and 24 weeks he hadn't made any appointments or come to see me. We'd talked a couple times and he sent me food but that's it. We weren't friends on social media at all and rarely were in contact. But at 6 months pregnant he showed a lot of interest in me and the baby. He came to visit routinely and brought diapers for the baby every time. We became friends on social media again. Then he asked if I wanted to try and fix our relationship. I was hesitant but I agreed and told him it'd be a trial period because I didn't fully trust him. So it's been a little over a month and I'm just not feeling it. We still bond and talk like friends but the romance part is gone. I'm not sexually attracted to him anymore and honestly I don't know if I love him anymore. He's been great and has been very honest and open about everything. He's even been routinely making appointments. I just don't want the relationship anymore. I spent so much time trying to get over him that it actually worked lol now I feel like I don't want anything to do with him. I just think that if I express this to him he won't be there for our son. Or be as interested as he is now. I'm not happy but seeing him excited about the baby makes me happy. If that makes sense. I guess I'm just not sure what to do. He's been talking about me moving back in with him but I'm honestly happy where I am. I'm 29w4d and the closer it gets to my due date the more I don't know what do with this situation. He's really trying and I feel bad because I don't want him anymore. I do think it'd be best for our son to have both parents in a household but I feel like it's gonna go to hell as soon I even attempt to move back in