I think this is an interesting thread and at a higher level makes me wonder what sort of conversations happened around lifestyle/ money before you got married.
My DP and I are both relatively strong earners but I am in a much stronger position financially post divorce, in the main because my exH and I avoided courts and settled our divorce quickly and relatively cheaply. Whereas my DP had a very high conflict/ drawn out divorce.
For that reason, I can afford nicer holidays. For myself and my DC. Bluntly speaking, do I plan to extend my money into providing the same level of holidays for my DP and his DC? No.
Do I intend to compromise the trips I take with my DC because of this. To some extent, of course, but otherwise, no. Does this make me a selfish partner? Possibly yes, but I’m also in the situation that my funds are finite so I have to make choices. But these are the sorts of conversations I would have in full, with my DP if we ever considered marriage.
I went on a very nice luxury holiday a few months ago, without my DP (my DC were due to go away with my exH) and my DP hasn’t been on one. I don’t think I should be vilified for that choice and I’d make that choice again. Do I view it as my role to pay for my DP? No. Would I if I was married? Not necessarily no.
So I think two things are being confused here. And terms like financial abuse are actually very strong and potentially misguided. It’s not financial abuse to provide for a partner but to use your own money for something for you. And if money wasn’t discussed by the OP and her DH up front then I think it needs to be discussed now.
The rest? Booking it and not telling you? And not thinking about his kids? Wrong. Playing golf all day on a weekend he has his kids? Again, imo, wrong. Completely misplaced priorities and shows to someone completely self involved.
Let him sort his kids. They’re not your job to look after when he has chosen to go away on a jolly.