Hailtomyteeth
'Did he want the baby'? Enough to stick his dick in his missus and wiggle it about.
There's no 'subconsciously' here. He thinks children, home and work are all the responsibility of his wife, and that he can duck out and go play builders with his brother because his mammy says so.
OP, I think you have a big problem.
But he didn't for the last 20 years of relationship and 9 years of that other child's life
Your being oversimplistic something as changes
What's changed is that the OP is no longer prepared to take on all of the mental load, all of the childcare, all of the housework, and do her own job, while DH does bugger all. And now she has to add in home schooling.
I suspect OP doesn't realise how long this has been the pattern, but now this last few months it's hit her. And then he chose to decide it was her job that was making her stressed - not his selfish, lazy arse.
Op I wouldn't blame you at all for telling him to shape up or ship out. Now he's got the ring on your finger, his treatment of you is only getting worse because he thinks you're trapped.