But he doesn’t want to?

So there’s this I’ve been dating for about 4 months now and I really love him. He is such an amazing person and I can’t believe that I have him but....

Recently all I’ve wanted to do is be more intimate with him, but the most I seem to get is a kiss. Now I don’t need to sleep with him, but I just want something a little deeper than what we have. Do I need to be more forward or do I just drop it and assume that things will improve on their own?