Boyfriend paying his mom’s bills?

So I live with my boyfriend. We live in his family house with his mom and brother. I went back to school full-time and I quit my job and he’s paying all of my bills. My boyfriend told me that his mom is charging him rent now. She is on disability after a work injury and cannot work and is going into retirement in 2 years. She is charging him $800 for both of us. I was fine with that since it’s cheaper than paying actual rent somewhere else. Then, I found out he’s also paying the household cellphone bills (~300), gives extra $ for the electric bill sometimes, and sometimes gives his mom his credit card to buy food. What frustrates me is that his 32 year old brother has no job, no schooling and does nothing with his life. All he does is eat, sleep, play video games, and manipulate their mom… for 6 years! His mom does not let him get a job bc she feels bad that he’s depressed. She always defends her depressed son and I think it’s unfair that my boyfriend is upholding the house finances while his brother does not do a thing except cook and spend his mom’s money on expensive ice-cream. He has no regard for finances, not even his mom’s. On top of all this, my bf’s mom and brother are angry at my boyfriend for his opposing political views and are passive-aggressive towards him and I. But when it comes to the rent she’s all in. I’m frustrated and my boyfriend said that it’s his finances and he’s paying all my bills. I want to move out and I know we can. But my boyfriend says it’s still cheaper living at home, until he can finish paying off his student loans next year. Am I wrong for feeling this way? What should I do? We’ve been together 4 years and he’s generally good with finances, but sometimes he can’t even put $ into his savings because of all the bills. Then, I wonder… What’s going to happen when we move out? How is his mom going to afford things?

Boyfriend paying his mom’s bills?
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