So effectively you called him inadequate and you called him an opportunistic user. Now you are surprised that he cut ties and you are blaming him for the pain he caused you? I don't mean to be rude but how would you react to your partner telling you that you were an inadequate opportunistic user? You seem to be portraying yourself as the victim without showing any understanding for the pain you caused him with your words, words that many AS would take very literally.
I apologise in advance for my directness, but this is a topic i as an AS man have experienced previously on a number of occasions so it does resonate with me quite a bit.
Love works two ways, if you are dating an AS that is ultimately your choice, it implies that you are willing to accept those shortcomings related to being on the spectrum. On the other hand though, he was also dating you, an NT, also a clear choice, and as such he should have been willing to make the necessary efforts to fulfil your needs. It's entirely your right to say that emotional affection the way you require it is a prerequisite for a relationship, but asking it of someone who can't provide it the way you require seems an exercise in futility.
I am engaged to an NT and I am committed and loyal to her, supportive of her, i really appreciate her kindness, warmness, caring and understanding towards me and i do my best to make sure that she gets the necessary reassurance that i do love her even though its very clear that it means different things to each of us. That however does NOT mean that her experience of love is any more meaningful than mine. It has involved an enormous amount of talking to each other with a view to appreciating each others strengths while accepting each others needs and shortcomings, but we have found a balance.
Speaking from my own experience, i never do things half assed, he probably did everything in his power to be what he thought he needed to be for you within the limits of his abilities, that in and of itself was likely his way of expressing of affection (he probably wouldn't have made the effort for anyone else), when you pointed out the one thing that he would likely never be good at no matter how hard he tried, he probably had flashbacks of past similar experiences, a profound awareness of inescapable inadequacy and inevitable future rejections combined with a deep seeded fear that no one would ever appreciate his strengths adequately to be able to accept his limitations. When I no longer thought that there was a workable solution to fundamental relationship problems, when things were asked of me that i could not provide, then i had to defend myself from further avoidable pain, i have always cut ties and walked away, just like he did. If it's done, it's done.