Petra, there is a book called “the bigamist” by Mary Turner Thomson who was married, or thought she was, to a man with a personality disorder. It’s a helluva tale, it’s worth finding some of the podcasts she did, but she says that everything he did to her was not about her. She has been able to manage her emotional reaction to being treated so appallingly (it really is a helluva tale) because she says it was not personal. He was like a cat toying with a mouse for fun, it did not occur to him what she might be feeling any more than the cat does the mouse.
Your ex won’t be thinking of you in the way you are of him and, yes, he will be able to set your romance aside and move on.
I am not saying that autism is a personality disorder but I am saying that it took me a long time to see my DH’s ability to compartmentalise as a symptom and not a cruelty directed at me.
It’s not personal, you needed an emotional connection that he did not and could not provide. His behaviour post break up shows you that and is a reminder that breaking up was the right thing to do. I stayed and live with a lack of emotional connection and it is slowly driving me mad because I need and want it and should have left years ago.
its hard for you now, but you have done the right thing.