We don't know the history. We've both read plenty of these posts from our brothers on this forum from their perspective and most either don't know how to initiate, if they do initiate they don't know to maintain the relationship with communication, some are not sure of their role, some have defeatist attitudes, some have been rejected time and time again, some have given up. Part of the issue is a general sense of "cluelessness" when it comes to reading all the "signals" a woman is sending. Part of it is the woman expecting the man to pursue and take the lead, which many don't know how to do. Some just fail at dating because of social and communication difficulties. A lot of variables at play here.I do not believe most people on the spectrum would behave like this person if they were actually interested. We might come accross as different but would not demonstrate interest by a complete lack of it.
Maybe it's an unusual case of autism or maybe it's other things or both. But something to consider is if this is how he treats you now, it is not very likely to change. WYSIWYG.