Hi
Diana11, I just thought I'd add something that occurred to me.
I had
no idea that my feeling different (and liking being unique...), feeling weird/alien, needing isolation, among many other traits., was ASD until I was 39. It was a big surprise. It's entirely possible that your ex has absolutely no idea either. If you don't know much about ASD then there's no reason to suspect it in yourself. In my case I found out because I went seeking answers, but if your ex isn't searching for answers for himself he may never know.
Also, for many Aspies, verbally articulating certain things, especially emotions or similar abstract concepts, can be extremely hard. It may also be that your ex hadn't reached a point of being self-aware enough to put the pieces together. Although Aspies tend to be a pretty introspective bunch, it can still be a challenge to view one's own behaviour with clarity.
I'm just saying this because I'd hate for you to hold a grudge against him for not speaking up about being unable to get closer to you. He may not have really seen that in himself, and may only have realised it in hindsight.