Idk he has a point. She's stingy to the point it actually affects her life negazively

He could have said it to her better. That he earns well enough now, that they can spend it together..

Yes, that's true. Her frugality goes beyond normal behavior and is too obsessive for most normies. But on the other hand, she fits perfectly with the ML who is also obsessive, so maybe it's not a problem with her, but a matter of partner compatibility. Yes, she and her ex didn't get along, but ML fits her perfectly in that regard.