To me there doesn't seem to be much downside. Moving can already be difficult and stressful, but if things get worse or continue to be bad OP will have to deal with that while dealing with the accumulated stress. If things are better for a short period that may be OP's ticket to have some breathing room and get out. If OP does move out, they can still remain friends and have a good relationship. People move all the time for all kinds of reasons.
Don't sugar coat it, he would basically be ending the relationship. It will also force the roommate to figure out a new living situation on top of all the other things: Working on stabilizing, Hospital Bills, Job Loss, dealing with shame/stigma in their friend group. This is part of why these things snowball downward in a positive feedback loop.
If it's going to be a chronic ongoing issue, I agree that OP should move out.
Yeah, the finance thing is what bothers me thinking about OP moving out. I hope his family can help him because if he’s visibly mentally unwell, poor guy is gonna have a hard time finding a new flatmate. It’s just a sad situation and I feel for both of these people.
