I left a partner who has OCD and probably some other issues that cause massive mood swings and make her do a lot of irrational things. I tried for years to help and be understanding. It never really got better, never ending ending, often self-made problems kept coming and it reached a point where I felt either we go both down or I have to leave. So I left. I feel guilty to some degree but it was also clear that I couldn't help. The interesting part is that me leaving her seems to have woken her up and she has a much better attitude now.

This makes me wonder if putting people with mental problems into a new situation away from family can break some of the negative patterns. My sister used to live with my parents for many years, barely left the home besides for work and in general just hated life. Then she went to a six month stationery treatment and you could see with very visit how she did better. Now she has her own place and an OK life . Maybe family or partners can prolong mental problems? Even if they want to help it's possible they are also contributing to the problem.