When I married Craig, I knew I wasn’t just gaining a husband—I was also stepping into the complicated bond he had with his mother. Eleanor was a proud and gentle woman who had been widowed early and lived alone in a small apartment in the next city. She never asked for help, but Craig worried about her constantly. About a year into our marriage, we decided to send her money every month to make life a little easier. We each contributed two hundred dollars, and Craig insisted on mailing the envelopes himself because he liked adding letters and postcards for her. I trusted him completely. That trust lasted until the day I found the envelope hidden in his nightstand—with the exact torn twenty-dollar bill I had given him still sitting on top.

At first, I tried to convince myself there had to be a simple explanation. Maybe he had forgotten to mail it, or maybe he planned to send it later. But doubt had already crept in. The following month, when Craig said he was heading to the post office, I offered to come along. He declined a little too quickly, so instead I quietly followed him in my car. He didn’t go to the post office at all. He parked behind a coffee shop, sat there for a few minutes, and then drove straight home as if nothing had happened. Later that night, I searched his travel bag and discovered another lie. The “three-day work conference” he had told me about wasn’t a conference at all—it was a gambling trip with friends.....