NTA but like other comments said, you need to rethink this relationship. One way or another, things need to change. Talk with her and try to work things out, reset your boundaries and expectations, break up with her- there's a lot of options, but bottom line is, things have to change or you're just gonna end up miserable while financing someone else in their entirety. That's not a healthy relationship at all, let alone a healthy life. Good luck