Advice?

My SO and I have been together for 2 years. When we started dating, he couldn't keep his hands off of me. He'd constantly be hugging me, kissing me, or holding my hand. And behind closed doors, he always wanted me. But lately its been the opposite. When we go to sleep he doesn't want to cuddle, and I have to fight him to have sex because he claims he's never in the mood. He always has some reason why we can't have sex. I understand he doesn't want to have sex every night, but I just miss how it used to be. How he would look at me and just throw me on the bed and kiss me. He doesn't do that anymore and I miss it so much. Has anyone else gone through this? I know things change in relationships as time goes on but I feel like he doesn't want me anymore and the anxiety that's giving me is making me crazy.