Curious to know if he truly understands that what you're asking for is generally for him to confirm that he hears and understands your feelings even if he doesn't agree in a general sense.... or is it possible that he's so focused on the Star issue that he's more trying to figure out how to resolve that?
If he understands that it's a more general issue, then I think it goes back to the question of whether he is actively trying to do better at that and willing to do the work, or if he's not even willing to do the work.
If he's trying and failing, then it might be worth more discussions about what he's trying and how he's trying and for him to continue trying to learn. Especially if he's only just now hearing and learning that this is a general issue between the 2 of you and he hasn't had long term knowledge that this is a repeat problem.
For you, it's an ongoing thing and you feel like you've been dealing with it a long time and that it isn't changing. But maybe for him this is a new problem and he's only been working on it for a very short time.
I think he legitimately does not understand what I am asking for. Like I'm speaking a language that doesn't make sense to him. It's why Henry thought he might be on the spectrum somewhere, because the very idea of someone just wanting acknowledgement was perplexing to him. He just says back to me, but of course I see you're upset, why do I need to say it? and doesn't seem to understand that isn't enough, or that something he legitimately does not see what the problem is so it isn't helpful in the slightest.
He understands that it's not about Star. I was very clear that I wanted him to do nothing about the situation, that I had just wanted to share my feelings. But I think the whole emotional management thing is very confusing to him. I am hoping that the book recommendations and possibly the joint counseling session will be helpful. I do think he is willing to try but he just isn't sure what to do.