I'm going to move out because my roommate is self destructive
Are they doing anything to hurt themselves?
Yes! they keep setting things on fire.
It does seem scary that your roommate is doing such harmful things, but you shouldn't just leave them. They are obviously in such distress they just want someone to help.
Maybe. Still thinking about it. I'm afraid.
It might be good to try and get a wellness check on them so they can get the mental help they need. You should not have to live in fear because of a roommate.