Sex with my boyfriend

My boyfriend has been getting mad at me lately because I’m not feeling sex with him. We’ve been together for over a year & I kind of feel like it got old & like he gets more pleasure out of it than me. I’ve tried talking to him about it but he just gets mad at me and starts calling me selfish. I don’t know what to do, I enjoy sex with him but it’s just not one of my priorities right now...