I agree with M1k3. I don't think anyone takes the decision lightly. I am struggling with it right now & It is tearing me apart. It is after all, HER disease. I have my own (codependancy) to deal with, and that is the only thing that I can change. I will always have some hope for her & won't ever entirely give up on her, but there will come a point where I can't cope with her disease any longer & I will have to leave for my own well being. Another sick person will not help her.
As for posting here, I welcome a different view. I believe it helps both sides. I think sometimes it easy to just see the disease & not the person. So post away I say!