Yeah no. If it's self defense it's not murder. And it's not an accident with him. But he's the kind of megadouche who would make you think it was, or who'd try to say it was your fault or that he's sorry he has to do it. And I'm not going to argue that was on the side of dumb, but he's not bad at the talking for a slimy subhuman. And you were new here. I should have paid attention and said something. I know what he's like, he killed me once.
I don't like to rule things out, but mostly I'm pro-people-living right now. You don't have to talk or be in the room. You can be in the next room. With a panic button. And probably cameras but also in as non-creepy a way as possible.
He killed you, so I'm calling it important. Murder in general is important, but murder of roommates and friends notches it up higher. Go read, a lot of people were pretty pissed off.
I don't know what to do with that. Google fails me. You told a psychopath and he reacted like that. It's not you, okay? It sucks, but it's not you.