Sex Drive HELPPPP

So my boyfriend and I have been together for over 2 years now and we had sex all the time. Kinky stuff and all. It was great, and now all of a sudden I’m not horny at all, and I have no sexual desire. He isn’t mad at me but he is slowly getting more and more depressed. He doesn’t have that glow about him anymore and I know it’s my fault. He says it isn’t because a relationship isn’t about sex, but he is a very physical and sexual person, which I love. But I can’t do anything anymore. I have no drive. What do I do.