It took only a glance across a restaurant for me to believe I had uncovered a betrayal. I spotted Sarah, my neighbor Mark’s wife, sitting in a booth with another man. They leaned close, laughing comfortably, and I immediately assumed their relationship was inappropriate. By the time I left, I was convinced I had witnessed something that could break Mark’s heart.

For days, the scene replayed in my mind. Mark was a thoughtful neighbor who helped shovel sidewalks and remembered little details about others. I felt that staying silent would make me complicit, and I rehearsed how I would tell him what I had seen. I never considered how little I actually knew.