You shouldn't reveal your best friend's secrets.
Jim's best friend has confided in him and revealed that he has had an affair.
Jim wants his best friend's wife to know the truth.
Jim discusses with his friend reasons why he must tell his wife what happened.
Jim contacts the wife and explains what he has learned from his best friend.
Jim's best friend caves in and tells his wife the secret he's been keeping.
Jim's best friend feels betrayed by him and no longer trusts him.