for me.usually when its over its over. I'm usually pretty pissed off thats its over mostly because I don't love that person anymore and alot of it was due to natural reasons. I've accepted it and I'm moving on.
But I can see how someone would wanna stay in a relationship like that, people are afraid of change, they are very comfortable with this person and although they may not love them the same way as you started off with, a part of you still does love them and not wanna let go.