It is important to keep in mind two things.
1), sex drive and need for intimacy waxes and wanes like the weather, only often far less predictably. There are particularly passionate spells, dry spells, and periods where the whole thing is present but fairly mellow and fluctuating between slightly more and slightly less than usual. It is possible that this is a perfectly normal 'next step' in the relationship as you exit that honeymoon stage. If this is the case, it would be annoying that it is not happening on the same timeline as you but is ultimately something that just happens
2), No one on here, including me, can say with any authority what is actually happening. We can only speculate. My understanding of the situation is of course very remote and my conclusions therefore will be of only very limited value. The only person who can say what is wrong, if anything at all, is him. The only person who can work to remedy your concern is him. The only person who can offer any comfort is him. But only if you bring this matter to him.
You can either bring this matter to him and stand a chance of working it out, or you can be left to worry about it alone. If you choose the latter option, either it will miraculously sort itself out (possible, but hardly worth betting on) or it will build into resentment.