I'm sorry OP but he seems to have left you, emotionally, just not told you and not moved out.
He barely helped me at all, when I asked him if he could do something, he was grumpy
Sometimes it comes from a real place where they're so selfish, they just don't want to help anyone else if it puts them through a tiny inconvenience, so that's why they get grumpy of huff.
With others, it's a deliverable attempt to make you feel like you're a nuisance, to make you feel small so that you eventually stop asking them for help.
Either way, this is not someone who's on your side. It shouldn't be this hard for you just to get something that should be freely given. For whatever reason, he's mean, stingy & selfish with you & the kids.
He paints himself as reasonable and logical and we're lucky to have him
Yes it can be. Sometimes it's not helpful to categorise people in terms of 'narcissist' and 'non-narcissist, but rather than traits that are on the spectrum.
Does he make out that his workplace would fall down without him? Does he monologue at people about boring minutiae of his business or corporate life? Make out that he's a super-hero and that barely anyone else could do what he does?
I mean there are jobs and situations like that out there, but there is a certain type of pompous, arrogant, lofty men who work in the corporate world like this. They make it to Director level, and then think they're 'The Chosen One' for the rest of their lives, even when they're retired. Everyone around them is either 'crazy' or just 'illogical' compared with their , superior intellect, which few could compete with.
This type is likely to think of their wife as a bit stupid. She may have started out as someone he viewed as his equal, but she is eventually designated to a sub-ordinate, almost employee-like status, who must not bother the C.E.O of the family with trivial matters, such as her health. No, as his personal, home-based, P.A, she must ensure the smooth running and functioning of the home without him, and never burden his Royal Highness for anything.
They have no plans at all in supporting her properly, and if they do, they'll bloody well remind her every chance they get because they're not naturally generous people.
This is not a matter of how responsibilities are shared practically - it's much more to do with status and what one person sees as being beneath them.