I don't think of standing as an "all or none" phenomenon.
For some people it is. I applaud them. I think they have what we all have: mortal terror of losing the spouse we loved, no real desire to play the field, fear of divorce, and they value their families. However they have an additional trait: fortitude and determination. A willingness to stand alone for however long it takes.
There are some of us who have all the traits in the beginning of the list, but lack the final one. The willingness to stand alone for as long as takes.
You know I think there are lots of LBS who still care about their MLCer, who still worry about their MLCer, and who feel great anguish and suffering as we watch our MLCer destroy their lives. We hope for the best. We hope our spouse will come out of it someday. I know in my case that I certainly hope that RCR is right, I hope that he wakes up someday and discovers that he values his family, and that he rebuilds his life from the wasteful destruction. I watch and wait and hope with baited breath.
The fact that an LBS is not willing or able to live alone does not mean they have necessarily stopped caring. I don't think we are less worthwhile human beings because of it. It is just that I am past the halfway point, and I cannot imagine continuing the road alone. It is to great a risk.