Depends on him and you. Asperger's is just a label.

That said, generalizing, he probably won't notice the hints you may give off as part of the courtship, subconscious or conscious, that most will miss anyway.

I would try to make it romantic, if that's what you want. You say you aren't 'officially dating'. Well, there is no 'official', but if you want a relationship to move forward as a romantic relationship, you should both know that it is romantic and that you both have to try to make it that way. As opposed to a friendship where two people discuss their psychological problems.

That was my mistake once. I fell horribly in love with a girl, was completely confused, and I ended up talking to her about my suspicions I had Asperger's rather than sweep her off her feed and make her romantic fantasies come true.