My 4-year-old told me: “Daddy takes me to a woman’s new house.” I followed them, but what I saw through the window shattered my heart.

Before he could even knock, a woman stepped out. She was beautiful, with soft brown hair. She hugged him—a long, intimate, comfortable embrace. The kind of hug that suggested years of history. I watched them walk inside, and the world felt like it was dissolving behind my windshield.

I drove home in a trance. I didn’t cry. Instead, I went to our bedroom, pulled out his suitcase, and began to pack. I threw in his clothes, his shoes, even his toothbrush. If he had built a secret life with a “secret” daughter-room, he could go live in it.