(NSFW) Why don't I feel like "being" with my partner?

I’ve been with my SO for 2 years. I love him and he loves me but a year ago I started losing interest in kissing him. I would give him a peck and a kiss on the cheek was fine but making out became boring for me. Now it’s come to a point where I hate doing it.

With sex its similar. It started 8 months ago and since that day I am never in the mood to do it. He will initiate it and push a bit, he doesn’t seem to be able to read my body language. It’s come to the point where I don’t want to hang out with him because he’ll be in the mood for sex and I won’t and it’ll be really annoying for me.