After a relationship of 1 year with my bf I suddenly lost my apartment. Because I don't have family nearby and my salary would make it almost impossible to find something my bf suggested I could maybe move in with him. My bf and his brother were gifted a big four bedroom house by their parents. A friend of theirs also lives there. We are all late twenties. My bf asked his housemates if they were okay with me moving in and they both said yes, no problem. We had a conversation with the four us to discuss it as well. They both seemed fully onboard so I moved in. Now two years later my bfs mother is very upset. Apparently my bfs brother hates living in his house and has become severely depressed. Their mother says it's because the "vibe" and the "flow" are off now in the house. She said the brother was never onboard with my moving in. She said it is common knowledge that a couple shouldn't live with single men and that we should have known it would be an immoral thing to do. She says we were obviously assholes in this situation. To make this living arrangement as pleasant as possible I do try to keep my "feminine" products in my room and I give them plenty of space to still have "boys night". I do try to be as accommodating as possible. I usually eat last so I'm not in their way in the kitchen and I only shower when they aren't home so I'm not hogging the bathroom. I make sure to not be affectionate towards my bf in common spaces so it doesn't get awkward for them. However I do admit that the "vibe" has changed since moving in. Before, the house was a real "bachelor pad". The only furniture being the couch, tv, and a fridge. Cleaning was never done. Dishes piled up in the sink, garbage bags were just sitting in the kitchen leaking on the floors, and empty pizza boxes were stacked up to the ceiling. I put some cabinets up to keep stuff off the floor (again I did ask if this was okay to do and they said yes), I now regularly clean the house, do laundry, take out the trash/cardboard/glass and overall keep things neat. Because of this my bf has become more responsible as well with chores. While I have been living here my bf has quit smoking weed, finished his degree and got a job. His brother smokes weed every hour from the moment he wakes up to the moment he goes to sleep. He didn't finish high school and has no plans to get a job. He doesn't know how to cook or do laundry. He just games all day. My bf has stopped hanging out with his brother since I moved in because without the weed he realized that he doesn't really like his brother and he isn't that fun to hang out with because my bf has "moved on from high school" (his words). I didn't force this on him, he made this choice himself. But admittedly the carefree bachelor vibe is gone. From my pov the brother is upset because of the contrast between their lives but their mother insists it's common sense living as a couple with single men is asshole behavior. So am I the asshole?