Miyah, let me ask you a question though - what makes you think he's your type? I know you have feelings for him, I'm sure you're feeling a connection with him at some level, but if you can work your way through that and give yourself a good straight-forward answer on that I think you'll better understand what you have to do.
With someone like him, I wish I could give better advice but I'd have to meet him, meet you, and see whats really at work (and yeah, that's not really practical). With him playing AD&D it could be a couple things - either shyness and him trying to do something just so he doesn't have to show it, or alternately he may not really get the idea of what relationships are about or what he should be showing you just so you don't feel like all your efforts are in vain.
Overall if its shyness you'll find that trust is something that a lot of aspie guys have had a lot of trouble with just because it gets to be a repetitive pattern - they open themselves up, they get burned, they open themselves up again, they get burned again, it can only go on for so long before they draw the connection that if they open themselves up and get burned - pfff, what were they expecting? I hate to say it but I think the only way to break a guy's shell down at that point is for him to realize for certain that you aren't like everyone else, that you won't flake out, he needs to not only have that trust cerebrally planted but he needs to feel it.
On the other hand if he's really oblivious I don't know what I'd advise, if you guys had some great conversations online and he didn't seem clueless then I'm taking it that what your seeing is really the in-realtime end of how AS works; your gestalt, your behavior, and a lot of things in general tend to not work right with what your really feeling and unfortunately its like being a parapalegic who walked once - sure they know how to physically do it but having their nervous system or body actually let them is a different matter all together. I think as you build trust that problem goes away because again, its partly defense mechanism. The only other thing I'd advise you on, if he's a bit on the cerebral side in terms of how he deals with people, try to show your love on that level - quite often as well its not that we don't feel emotions, if anything our sympathetic shielding is too little and we almost get overdosed by what other people are emitting, that's why I almost think as well - if you think this is adding up to what you see in him - that being slick or at least keeping the outward emotionality of it real grounded and natural would make it much easier for him to open up.
Hate to say all this because it almost seems wrong, its usually guys who are supposed to go through the ringer like that for women not vice a versa, but if your really interested in him and if some of that applies you may want to try it out - subtly at first of course just to see if your hitting him from the right angles.