Cruelty always feels more confident when it has an audience—and a spotless tablecloth.

We were sitting in the dining room of the house outside Nashville that I had spent two years restoring after marrying Daniel. New flooring, fixed plumbing, a kitchen that no longer smelled damp whenever it rained. I had prepared pot roast, green beans, and the lemon pie Daniel liked because I was still performing a version of marriage that required effort, dignity, and hope—long after both should have demanded better conditions.

Ethan was 17, broad-shouldered, attractive in the unfinished way boys become when too much is excused too early. He was permanently resentful that I existed after his parents’ divorce. I had accepted the resentment. I had even accepted the disrespect. What I had not accepted—though perhaps I should have earlier—was Daniel’s silence about it. He liked to call it “not forcing the issue.” In practice, it meant allowing his son to sharpen himself on me until one of us bled enough to become inconvenient.

That night, Ethan cut into his food, looked directly at me, and said, “You’re a loser. But my mom isn’t.”....