OP, I have such a similar story to yours, I actually checked the date to see if I'd ever voiced my feelings and that this was my own zombie thread.
I spent years feeling angry because I thought my dh didn't care about me. Now I know what's happening.
It's incredibly disabilist to say the ASC doesn't matter, it's just like saying "oh, I don't even see colour". It ignores the experience of those who are actuay disabled, or actually POC. They don't get to ignore it because it impacts everything they do and say.
My dh may appear to prioritise the wrong things. He may appear to be purely rational and uncaring.
HIS reality is that he finds emotional problems pretty terrifying because they cannot be dealt with following a proscribed set of rules, he shuts down and minimises like a professional.
If there is a drama, and he knows he must act, he will do what he has seen people do/ what is his duty.
Example would be, he can't see my symptoms, and has no clue about my medical problem, so doesn't ask because the answer might be difficult/ unpleasant/ something he can't fix.
When I rang him from hospital with chest pains, he insisted on coming and sitting with me, even though he had to make all sorts of complicated arrangements, even though I said I would truly be fine on my own, and it already looked as if I was fine. He said, "but you have to stay with someone if they're in A&E!" That was one of my first signs that his deciding making is based on some matrix or criteria in his head that doesn't seem to have anything to do with what's in front of him. If you try and dismantle the scaffolding/rules he's relied on his whole life he just looks lost or baffled. Which is why he finds the way I parent so difficult. If he has to do something out of duty, he will do it because he must, or worst case, out of fear. I am not interested in the kids being scared or pummelled into behaving in a was that makes everyone else feel comfortable.
If one of them is terrified at the thought of going to a party, I'm not going to make him go, just because we've RSVPd. DH has taken a long time to accept that the more you pressgang a child into behaving correctly, the more likely they are to have difficulties later.
We talked about separation and he was so upset. (He too has his fill of emotional/ intimate stuff, and then chugs on happily for a long time without a hug or even a warm word. He's not cold, or unkind, just friend- like. )
He said, in the end, that he could not see why I was so miserable, but he did not want me to be miserable, so if he needed to leave, he would.
I too, cannot imagine him sole parenting for any length of time.
I'm in my 50s now, but if I'd had a premonition, I hope that I would've found another way forward.
I can't wish our relationship away, but I wish we'd known earlier what the problem was.
If you have the strength to leave, I think perhaps you should. The problem for me now is that I cannot bear for DH to be alone, or for the kids to see him differently/ get angry with him, when it's not his fault.
It's all very well for pps to say "if he wants to he'll change". I don't know your husband, but I know mine has tried so hard, and I might as well ask him to carry me up Everest. He just CAN'T.
But that's MY choice, and now it's a choice I've made, not something foisted on me.
Good luck OP, I'll be interested to see how you go.