Some friends will swear secrecy when you tell them something confidential. When you find this information is now common knowledge, you may well be furious and decide to end the friendship. But dishonest and untruthful people can also do harm in many other ways. They may lie to you about their debts or if they are having problems at work. They may also be insincere and lie to you about what they think of your behavior when you ask them for feedback