Boyfriend struggles!

When I first got with my boyfriend 7 months ago everything was fine but now he just doesn't seem interested in me. Don't get me wrong I know it's not all about sex but he just doesn't seem to care anymore. If it was up to him we wouldn't have it at all, I'm 16 and he's 19, he blames it on the fact he doesn't need to but I can't help thinking there's more too it :(