After my wife, Chloe, started changing the sheets twice a day, I began testing her loyalty.

I left work early to go home, only to walk in on my wife and her friend chatting away in the kitchen, deep in conversation.

Ashley spooned some soup and offered it to Mark, her friend, to taste.

Their expressions were completely normal, though, not a hint of anything out of place.

At dinner, Mark even joked with me.

“Leo, you’re not mad that I was just chatting with your wife, are you?”

I smiled and shook my head.

But then, something strange hit me. The bedsheets, which I’d changed that very morning, had been replaced with an identical set.