No way, I totally understand being unconditionally comitted to my kids as opposed to my partner. My kids need me, they depend on my for their survival and unless something really goes askew in that relationship, they will never leave me. Sure they hopfully will move out, get married, and have their own kids but they will still be my children and I will be their mother. If my husband leaves me, I can be replaced. He is independent of me and a large part of our being together is what we found attractive within eachother. We chose eachother and we could just as easily dispose of eachother. That threat is always there and if You've had significant loss in your life, as I have, that fear of the past repeating itself is always in the back of my mind.
Personally, for me, my fear is much worse in regard to being emotionally abandoned within a relationship that is still ongoing, than to be physically abandoned.