I just need some advice

I have never been in a serious relationship before so this would be my first one. But we fell upon this really big issue that caused a lot of problems later on. We used to have sex very often and i got tired of it, idk why I was just never in the mood anymore which I know could be hard for the male because they feel the need to release but that’s besides the point. I wasn’t feeling sex meaning I didn’t want to have sex but this one night we were cuddling having a good time and he got on top of me and asked if it was okay, i said sure but knew that I wasn’t in the mood which he knew I wasn’t into it either. I laid there staring at the ceiling while he had sex with my body. afterwards I felt disgusted and I just couldn’t be touch or kissed by him again. We are about to hit a year and I started to realize something was off about me. I didn’t feel comfortable making out or saying I love you anymore. It almost felt like when I did say it, I didn’t mean it. My hearts hurts a lot more and I have trouble breathing every time I try to talk about it. We ended up talking about it and crying together hoping to fix our relationship but i feel like i’m giving up and there is just no solution. Is something wrong with the relationship, or is it me?