I realized, in that moment, the day my ex-husband left me was not the worst day of my life, as I had thought for the past several decades. It was the best day of my life. All those years, I had blamed myself for the failed marriage. Now I knew Tim never would have been faithful to me. He had left the woman he'd had an affair with while married to me for another woman half his age. As Dr. Mendenhall said, "He has a hole in his heart."