lolitalola, fears of abandonment and lonliness are the most frequent reasons that a person stays in a relationship that they know is destructive.
The book.."The Saber-Toothed Tiger" is a book that specifically addresses this issue. You can get it on Amazon..very easy to read.
I see that you have been on the forum for a couple of years--so, I imagine you are
pretty well informed about alcoholism and co-dependency stuff.
dandylion