Idk why I do this to myself

Sorry for any weird formatting, I’m on mobile but basically I knew my boyfriend was lying to me about some stuff, Idrc cause everyone tells their versions of events and sometimes people change or wtv. But I’ve been living with him for like three months now, and he used to be such a gentleman. Now he’s constantly moody, always thinking I’m mad at him, short tempered, and a little checked out.

We live at his parents place because it’s cheaper than an apartment, but his brother lives with us as well, and his brother is dating his ex. I’ve known since early on in the relationship, but he made it seem like she cheated on him, and was abusive. He still shuts down when he sees her, and has super strong opinions about her. His sister has recently given some clarity to the situation though. She mentioned their open relationship which according to him they were never in, she mentioned their toxicity and did admit they were bad for eachother, his sister also clarified how my boyfriend and his ex broke up, and how she started dating my boyfriends brother.

I also know he’s lied to me about small shit like the girl he was seeing before me, and how long there were seeing eachother. It bugs me because he’s even lied about interests and made it seem like he was more into the same things as me, but as time goes on he keeps changing, and I’m not sure if it’s for the better.

I feel like I’m the one managing his life, and supporting it. I tell him to wash laundry, he stopped cleaning as soon as I moved in, he neglects his hygiene, etc. I have no clue where I’m going or what I’m doing at this point. Idk what to do or how to do it.