Are they more your friends than his?
On one hand I think he's being a bit childish 'I'm not going if you don't come' 🙄🙄.
I can't ski anymore (injury) but when I could I went alone, with groups of people who had someone drop out last minute. With friends hose parent couldn't go (they used to pay, she loved it & would baby sit a couple of evenings, collect the kids from ski school etc).
if he loves skiing that much he'd go. Maybe you need to discuss it properly & stop any guilt he feels about going
but I suspect you won't because you've got yourself in a right strop about it.
you really are coming across as a right stroppy mare. Sulky & miserable. As well as resentful about the money. It'll be a lot less than £2000 more without your ski pass & kit hire. Besides, you'd have spent it if YOU coukd ski. Now you're saying you could save the £2000 & making him feel guilty.
yes, it's sucks not being able to ski. Trust me, I understand. But ski resorts are beautiful places & sociable. You can take taxis, gondolas. Not everyone skis all day, every day, there's plenty of other things to do, people around. I get the ski chalet isn't luxurious, but you can still get cosy on your bed & watch a film, read a book, whatever.
you're both being unreasonable.