Sadly as has already been said, we have seen such stories a number of times here. Though in your case, it seems you have indeed spelled out a very poor prognosis of rekindling such a relationship.
First and foremost in consideration of how much time has gone by, especially taking into account how long the relationship lasted up to the point when he broke up with you. Plus the latest contact with him pretty much leaves you without any doubt that he couldn't deal with the relationship. If he is on the spectrum, he may be someone who has surmised that he simply cannot handle all the basics of any relationship. Not when we so often need and seek solitude as part of our emotional regimen. In this regard, it may not be as personal as it must all look to you. That it was ultimately about him- not you. That it was likely painful to him to have hurt you in such a way, but that for him there was no other way to deal with his issues.
Second, that even in the likelihood of a sincere wish to get back together again, I suspect your own ire would eventually catch up with you and that it's quite possible that it would be yourself who would eventually end the relationship.
I've been there. I was the guy who abruptly ended a relationship with someone who I thought was the love of my life. And while we got back together again, it was never the same. Her ire caught up with her and she eventually abruptly dumped me. And I tried in vain to get her back, but she was gone and never looked back. Though in my case neither myself or her knew at the time I was on the spectrum. That would come many years and other failed relationships later.
At this point you honestly need to consider your needs and not his. To move on, and not giving him further thought, no matter how the mystery of his possible autism may weigh on your mind. Another thing to consider is for him to come to grips with his own autism, it must really come from him alone and no other person. Otherwise the possibility of denial and him dismissing the notion by much of anyone is highly likely. Intervening with even the best of intentions is not advisable.