My advice is to open your heart up, communicate how much you miss sex, ask him how he feels about it, and pay attention!  If he empathizes but things don't change, you've got a partner who can't or won't meet your needs. 

If he tears up and says it's always been a problem, he doesn't understand it either, etc, but is willing to work on it, then you may want to give the relationship more time to see if things improve. But put a time limit on how long you'll give things to improve!

My very strong hunch, based both on difficult personal experience and from talking to other women who've had similar experiences, is that this guy is not interested in sex. Maybe the intimacy is too scary, maybe he can't perform without having a sense of newness with a partner, maybe he's really a sexless morph who just would rather not get it on very often. 

He's not going to change. 
And most often, things will get worse, not better. 
Don't waste too much time with him, and good luck!