Gf’s mom says she shouldn’t have to contribute financially (30M/28F)

My (30M) gf (28F) and I have been together almost a year and a half and live together. We lived about an hour apart previously and agreed to get an apartment together about 6 months ago. I pay ~$1500 of the rent, she pays the remaining $800 plus groceries and I cover utilities, etc. so she can use the rest of her pay to cover her personal bills.

While she was in school, I agreed to pay the full rent (December – April) until she graduated. After that passed, she made no offer to pay her portion of May rent and paid her portion of June, but had no money left so I sent her $400 back, filled her gas tank multiple times, covered groceries, etc.

Last night, she asks if she can use her next paycheck to pay off her credit card to which I said sure. Later, she tells her mom that I told her she didn’t have to pay her portion of the rent this month (which was never said in our conversation, nor did she ask.) Her mom said to her that “You never wanna be in a relationship where you have to pay your share of the bills because then you’re a roommate.”

I don’t know how to feel about this and I’m starting to feel like I’m being taken advantage of and that her mom is reinforcing this idea that she shouldn’t have to financially contribute at all. According to the same conversation, “You give unconditional love and compassion you contribute to the household with acts of kindness. Taking care of the house be a good listener, companion” which is all necessary stuff in a relationship, but doesn’t mean I’m a pocket book. Can anyone share some outside perspective here?