>there's no right answer

There's a lot of wrong ones, though. If he insists OP pay half of his lifestyle, he's a selfish prick. She should pay what she can afford and not a penny more. Ideally that means he covers the rest, given his income is so much higher, but at minimum it means she's not spending money she doesn't have.

If the only people interested in you are party girls, that's entirely a you problem.

Are you employed, not obese, have your own place (ideally owning, or renting without roommates), have reliable transportation, shower regularly? That's really all it takes. Be a productive member of society and eventually you'll find another productive member of society interested in you.

There's a lot wrong with him. But being used for sex isn't one of them lol

Then why did you break up with her? Sounds like it was a "test" to see if she'd start doing what you wanted. That's toxic af. Break up or get back together (as she is, with no expectation of change), none of this manipulative nonsense.

When your whole identity is about what you don't have...