I need to explain something before I start. I am not the kind of woman who snoops. I never have been. I always thought women who checked their husbands’ phones were just looking for trouble.

For fifteen years, Mark and I had a quiet, comfortable life in Parma, Ohio. We lived in a split-level house on a quiet street. We had a dog, a mortgage, and a routine that felt as solid as concrete.

Mark worked at a precision machining shop in Cleveland. I worked as a billing clerk for a medical supply company. We didn’t have kids. We tried for years, went through three painful rounds of IVF, and eventually had to accept that it wasn’t going to happen for us. Mark was the one who held me while I cried. He told me it was okay. He said, “It is just you and me, Sarah. That is all I need in this life.” I believed him with every single cell of my body.

He drove an old silver Chevy Equinox. He was meticulous about that car. He cleaned it every Sunday, vacuumed the carpets, and kept a little silver keychain I gave him for our fifth anniversary hanging from the ignition. It had a small metal tag that said, “Safe Drive, Love Sarah.” Every time he started the car, that little tag clinked against the steering column. It was a comfortable, familiar sound.

Our routine was simple. Mark left for work at 7:30 AM and was usually home by 5:30 PM. But about three years ago, things started to shift. The shop was taking on defense contracts, he said. He started working late. First it was just Tuesdays. Then it was Tuesdays and Thursdays.

He wouldn’t get home until almost 11:00 PM. He always looked exhausted, his clothes smelling of machine oil and fast food.

I felt bad for him. I started leaving plates of dinner in the microwave with sticky notes. I made sure his favorite shirts were always ironed. I wanted to make his hard life a little easier. I never questioned it. Why would I? He was my husband.

Then came the day I went to clean out the glovebox. I was looking for the tire pressure gauge because my front left tire looked a little low. I pulled out a handful of papers. Among them was an invoice from the Firestone on Ridge Road. It was an oil change receipt from exactly twelve months prior. I don’t know why, but my eyes drifted to the mileage.