life with partner almost non existent?

Me and my partner have been together for four years now. He is 23 and I am 19. We have a good relationship but recently his drive has decreased drastically. We used to have a fantastic life and would always do things to spice it up but now he’s just lost interest in it. He used to want it all the time to the point where I couldn’t keep up with it lol but now I’m the one who wants it and he doesn’t. It’s not as though I want it all the time but we’ve only slept together 3 times in 3 weeks! I would like it a little more often than that. I know he isn’t cheating for a fact so I know that’s not the problem. There has been recent changes to our relationship though which are .. He used to smoke weed all the time but now he has stopped completely and we have recently moved back into our house after staying with a relative for awhile. Why doesn’t he want it? He will stay up all night listening to music or playing video games but won’t come up to bed until I am asleep. Saucy underwear worked at first but now I don’t even bother because he don’t come up to bed. I even asked him where my vibrator was earlier to “Hint” to him I was in the mood. But instead he just simply told me where it was. It’s getting frustrating, we’ve just moved back into our own home and I want to take full advantage of that, but instead he just isn’t interested. What can I do?