My opinion - I would seriously consider marriage counselling. If you still love him and want to stay together, you need to take some action before it’s too late.
You’ve told him what you think and feel and he’s ignoring it. He’s not taking your concerns seriously. If this thoughtless, selfish behaviour continues, it’s likely that you’ll feel so disenchanted that at some point, there’ll be no marriage to save.
Sometimes, talking to a non judgmental third party can open up an actual discussion and both parties can see what’s needed. It could be the wake up call he needs. If he won’t participate, you can go alone to talk through options.
I feel so sorry for you - I’m a saver, planner too and could not bear this behaviour. I hate spur of the moment invitations as I need time to think and prepare. Plus, I couldn’t bear to think that I’d have money worries in retirement.
I really think you need to take some action now, before it’s too late.