Do you tell him his wife is cheating?

Do you tell him his wife is cheating?

“I live on a quiet road and noticed a truck idling that I’ve never seen before. As I looked out my window, I noticed a stranger kiss my married neighbor, then he ran out to his truck.
Should I tell her husband that I think she’s having an affair?”
What do you think?
February 25, 2021
Pete Kelly - Weekdays 10-2PM