I can understand where antlers is coming from a parent who has died really didn't have a choice, (even in suicide where the pain is too much to deal with, kids will not understand that choice at the time)

But a parent who chooses another person over their child has to be painful, because that parent is still living on this earth, but has made the choice of hurting his or her kids daily, knowing that your parent has chosen to leave for some one he or she met at work or over the internet, to be still on this earth breathing and living and still not make your kids a priority or to cut them off completely is more painful than the death of a parent in my opinion.