Update: He's pretty gone. Calling one person after another to talk loudly. He was in the kitchen and I asked him to go to the other room for a minute because I needed to give the cat medicine, and he was too freaked out to go in. A couple minutes later he said to the person on the phone, "It's not ideal, but what are you gonna do?" And then, "Yeah, I hate it." I'm afraid he was talking about sharing the house with me. It could have been work, because he's also been talking about working from home. He's not acting like he hates the situation, but he could very well just be hiding his feelings from me. I went back by his room after he got off the phone and said the kitchen was free again, and I hoped he wasn't mad that I asked him to leave in the middle of his call. He said, It's fine.
I know I shouldn't have said anything to him about asking him to leave the room--I was being polite. Now he's playing his music loud, which he hasn't done in days. He's definitely operating from a messed up place... but if he hates being here with me so much, IF that's what he was saying... I don't know.
If he keeps playing his music, it makes me thinks he's challenging me. But also he's probably not thinking that clearly.
