Promise me, we won’t ever do this again,” Sadie said. “Promise me, that no matter what happens, no matter what dumb thing we supposedly perpetrate on each other, we won’t ever go six years without talking to each other. Promise me you’ll always forgive me, and I promise I’ll always forgive you.” These, of course, are the kinds of vows young people feel comfortable making when they have no idea what life has in store for them.