Things have been awful the last 3 months and I’m terrified DH now thinks this is acceptable.
It's ultimatum time then isn't it OP.
But I DON'T mean that you give an ultimatum to him.
I mean you finally sit yourself down & give yourself a bloody good talking-to about your own life, your own value, & your own self-worth. And present yourself with your own ultimatum: he either stops being a moody bastard to me & the kids, or we remove ourselves from his moods.
That whole 11:26 update is so sad.
You have been managing for so long, & of course, like any decent person, you expected to make some compromises & accommodations for suspected ASD.
But here's the thing about compromise - when it only goes one way, it's not compromise, it's being taken advantage of.
There are sterner words available than "take advantage" but I don't think they need trotting out right now, as you'll already know what they are.
It boils down to - your H has treated you appallingly for years, & you trying to 'fix' that by being kind, talking, pandering, telling, counselling, urging him to get diagnosed ... none of this has worked, so by now - you know that none of it ever will work.
Maybe resist any urge to sudden change prompted by some of the ... less helpful posts made here, & sit with that for a few days. PP suggestion that you go & stay with a friend or relative for a few days was very helpful - what barriers are there to you doing that?
(& would H sabotage any attempt for you to do so? The suggestion was you go without the kids for a proper break, but I can't imagine you'd relax without them, or more truthfully, without being able to supervise their father's behaviour around them ...????)
Keep posting, never mind the goad about having posted about the problem before - so what? PP who've been through similar won't berate or victim blame you, & you can safely ignore anyone who does. You've got a hell of a lot on your plate, & you can only manage the changes you need to see or make at your own pace. 