I've lived through the divorce of my parents, and I don't know if there's a much worse non-abusive thing you can do to a child.
Coming from the personal experience of my parents' ugly relationship, I can tell you there is something far worse for children than divorce. Living in a home where two parents are constantly at each others throats, spitting venom day after day, is toxic. I can still remember that blissful April day in 1993 when my dad moved to his own little house about a mile away. Close enough that I could walk between homes, but far enough apart to ensure some peace for all parties. All became right in the world. It is without a doubt one of the best moments of my childhood.