I believe that some women are so soured on men and relationships after a bad marriage, that staying in the marriage just for financial support works. As long as the two can exist in the same space without fighting or bothering one another and the children have both parents, it can work....
Is it healthy? Now thats another story, I think not.
This situation like so many others is completely governed by whats right for that person. It may not be right for someone else, but who are we to judge?
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Take a peek at my BLOG:

http://charleen-micheles.blogspot.com/