Honesty requires that you tell your wife that a reliable third party informed you of the cheating. You may think it is best to say that you have no direct knowledge of the cheating, which is technically correct, but it’s a lie by omission. Denying you know anything about it is an outright lie – a lie by commission. Your primary responsibility is to the truth. You may rationalize saying nothing out of loyalty to your friend. However, loyalty is generally a secondary value to honesty. If it were not, then one could rationalize doing something wrong or failing to act out in the right way out of loyalty to another party.

Let’s assume you have discovered through a reliable third party that your best friend is cheating on his wife. Your wife asks whether you know anything about it after seeing your friend with another woman at a restaurant. Would you:

Confide in her that the cheating is going on.
Deny you know anything about it.
Tell her your friend hasn’t said anything to you about it.

📁Local Disk (C:)
└📁Program Files (x86)
⠀└📁steam
⠀⠀└📁steamapps
⠀⠀⠀└📁common
⠀⠀⠀⠀└📁Counter-Strike: Global Offensive
⠀⠀⠀⠀⠀└📁Skills
⠀⠀⠀⠀⠀⠀└⚠️This folder is empty
⠀⠀⠀⠀⠀└📁 Aim
⠀⠀⠀⠀⠀⠀└⚠️This folder is empty
📁USB (D:)
└word.exe⠀
L ✅+rep

My Grandfather smoked his whole life. I was about 10 years old when my mother said to him, "If you ever want to see your grandchildren graduate, you have to stop immediately." Tears welled up in his eyes when he realized what exactly was at stake. He gave it up immediately. Three years later he died of lung cancer. It was really sad and destroyed me. My mother said to me- "Don't ever smoke. Please don't put your family through what your Grandfather put us through." I agreed. At 28, I have never touched a cigarette. I must say, I feel a very slight sense of regret for never having done it, because your gamesense gave me cancer anyway.