The divorce was supposed to be the end of the “hard part.” After years of cold dinners and whispered arguments, the paperwork was signed, the assets were split, and a fragile peace had settled. When my 14-year-old son, Leo, asked to live with his father, I felt a sharp pang in my chest, but I didn’t fight it. I wanted him to feel he had a choice. His dad, Mark, had moved into a modern bachelor pad closer to the city, and to a teenage boy, it looked like freedom.