It's nice to see a dad saying these things:
No matter how well we performed the divorce ritual, the kids get chewed up and spit out. ("But John... that isn't very comforting." This isn't about comfort. This is about your child.) I have heard parents tell their children to "grow up!" when they were whining about missing the other parent. Children are not supposed to grow up. They are supposed to be children! Adolescents "grow up." Then adults are supposed to be grown up. That's how it works, Bub. Reset your thinking.... Expect the child to take a long time to get used to living with a broken home and a broken heart.