I've never been married, but I've been in some fairly long relationships. In any relationship, things occur that are ambiguous and open to interpretation. The women who have worked well with me have an optimistic attitude and default to optimistic feelings and positive interpretations when challenged with an ambiguity. So, when in doubt, try to presume the best. I'm not saying be a fool, just be positive.
Also, be open to more physical interactions. Autistics don't communicate well in some modes, so he might start using little bumps, pokes, etc. to let you know he's thinking about you.