“For Abby, "friend" is a word whose sharp corners have been worn smooth by overuse. "I'm friends with the guys in IT," she might say, or "I'm meeting some friends after work."

But she remembers when the word "friend" could draw blood. She and Gretchen spent hours ranking their friendships, trying to determine who was a best friend and who was an everyday friend, debating whether anyone could have two best friends at the same time, writing each other's names over and over in purple ink, buzzed on the dopamine high of belonging to someone else, having a total stranger choose you, someone who wanted to know you, another person who cared that you were alive.”