I'm not talking about someone who's in denial; I'm talking about someone who is aware that s/he has a problem, but won't do anything about it. It could be a partner, close friend, or relative. How do you deal with something like this when you have your own mental health issues?

I've been on intermittent leave from work due to anxiety, depression, and other issues, and had been out for two months on short term disability earlier this year. I've been working with my regular doctor, a therapist, and a psychiatrist. My SO has depression and PTSD, but he's not really doing much to help himself. He had an Rx for Prozac and stopped taking it, and went to two sessions with a counselor (I don't know why he stopped going). My psychiatrist thinks that I am also bipolar and have ADHD, so I am dealing with that, too. I am having a hard time dealing with my own stuff AND his stuff. I know that there are resources out there, but there's always a reason that he can't or won't use them. Has anyone else been through this? I am trying to be understanding because I know what it's like, but it gets exhausting.