My ex-husband, Ethan Caldwell, cheated on me, walked out on me and our son, and still had the nerve to invite us to his wedding. During his speech, he laughed and told a room full of guests, “Leaving that mess was the best decision I ever made.” People laughed along with him.

Then my son stood up, took the microphone, and said calmly, “I brought you something, Dad.”

When Ethan opened the box, the sound that came out of him silencedThe invitation came in a thick ivory envelope with gold lettering—the kind meant to make cruelty look sophisticated.

Ethan was getting married again.

He’d had an affair with a woman from his …