Concerned that my gf (34f) at this point only likes me (30m) for money (what little I have) and other little shit that I do. How do I know?

Ive been with a woman for 8 months. I am concerned that at this point she only likes me for money and want me for financial stability...what do I do? And how do I know? Other than "just leave her bro" how do I approach this argument.