Asking Ex for $6500 because she made us adopt a cat

... and then abandoned us both. Fair? I love the cat and all but it wasn't adopted as a kitten, was probably feral, and has no vet history. Basically just chillin and livin the life

I figure $70/mo on average of taking care of her. That's $840/yr. At 10 more years that's $8400

One vet visit year or so. That's another $1500-2000

When she gets older, maybe 3-4 more serious vet visits, around $1000, that's $3000?

Maybe a potential operation and cost of eventually putting my kitty down? couple thousand?

I told her I'd eat the cost of anything over and not ask for more money. Just want things done and done.