I’m in my mid-20s and recently moved into a house with two other girls I found through a roommate app. We all got along fine at first shared groceries, made dinner together, watched Netflix in the living room kind of vibe. Everything seemed normal.

A few weeks ago, one of them asked if her brother (who had just moved to our city) could crash on our couch for “a few nights” while he apartment hunted. We said okay, and he moved in with a backpack and a smile.

It’s now been three weeks.

He’s still here. He showers in the morning before anyone else can. He eats the shared groceries. He leaves his socks in the bathroom. He also… wanders. I’ve caught him twice just kind of hovering near my room late at night. No knocking, no reason. One time I opened the door and he said he “thought he heard a noise.” My room is at the end of the hall.

So I started locking my bedroom door at night.

A few nights ago, I overheard him say something like, “It’s kind of rude how she locks her door like we’re all criminals.” The next day, my roommate told me I’m “making things weird” and “if I don’t feel safe here, maybe this isn’t the right place for me.”

I said her brother isn’t even supposed to be living here and I’m not going to sleep with my door unlocked when some guy I don’t know is pacing the hallway at midnight. She rolled her eyes and said I’m being dramatic.

Now the vibe in the house is completely off. I’m eating meals in my room and keeping headphones in just to avoid talking. But am I seriously the AH for locking my door? I didn’t sign up to live with a stranger who treats personal space like a suggestion...