My wife was determined that our 7-year-old son learn to play the guitar, so she arranged lessons with a 25-year-old instructor. One day, when she wasn’t feeling well, I took our son to his lesson instead. On the way, he began to cry. I told him he didn’t have to go if he didn’t want to. To my surprise, he stopped and said, “Mom says I have to, because I have talent like my dad.”

That startled me—because I don’t play any musical instruments.

Wanting to understand more, I decided to meet the guitar teacher in person. When I walked into his house, I was shocked by what I saw. There were details that reminded me of my wife everywhere: her favorite lucky bamboo plant stood in the corner, the furniture was teal (her favorite color), and he even offered me the exact drink she always chooses. Then I noticed a satin scarf on one of the chairs, identical to one my wife owns. I couldn’t help but question whether this was all coincidence.

That night, I confronted my wife. At first, she brushed it off and accused me of being paranoid. But eventually, she broke down and admitted she had known the teacher back in college—he had been her boyfriend for a short time. She swore there was no affair now, but her confession shook me to my core.

Since then, one thought has been haunting me: should I get a DNA test for our son? The doubt is eating away at me, and I don’t know how to move forward.