From what I understand, what you are going through is "normalization." At the beginning of a relationship, it's the "honey moon" phase where you can talk endlessly about nothing, and then things get normal. All those hours spent communicating have dramatically reduced the things you have to converse about. Essentially this is going to be the normal everyday type of relationship you have. If you get to this point and still feel the same way for the person, than it's likely your relationship is headed in the right direction. I do know it is REALLY hard to get use to not talking and communicating so much though, so stick with it...
I'm sure he knows you care about him, but I personally(I'm in a LDR too) try to let him know each day I appreciate him, and love him. I post cute sayings on his FB wall. I try to read about something he mentioned, or watch something on TV he's interested in. For instance, I watched a sporting event my SO was interested in last night, while he was watching it, so he could explain some of things I don't understand to me. You have to find things that work for the two of you. Best of luck!!!
I'm thinking 'bout how people fall in love in mysterious ways, Maybe it's all part of a plan, Well, I'll just keep on making the same mistakes, Hoping that you'll understand--Ed Sheeran