Deception by others can leave you feeling unsteady and confused. If you think that someone may be deceiving you, you might want to confront that person to obtain a confession, to let him know that you are aware of the lies, or to prevent future lying behavior, according to executive coach Carol Kinsey Goman, in the Forbes article, "How to Deal With Liars at Work." Robert Feldman, author and professor of psychology at the University of Massachusetts Amherst agrees, stating on his website that when you ignore a lie, in a sense, you become a liar yourself.
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Decide whether confrontation is the right approach. In her book, "Playing the Lying Game: Detecting and Dealing with Lies and Liars, From Occasional Fibbers to Frequent Fabricators," sociologist Gini Graham Scott suggests the decision to confront depends on the type of lie and your relationship to the person who you think is deceiving you. If it is a white lie, or a casual acquaintance, it may make more sense to let it pass. In more personal relationships, when lying can break trust and affect intimacy, confrontation is usually the right choice.
Gather evidence in the event that you need to prove that deception occurred. In the Forbes article, "How to Deal With Liars at Work," executive coach Carol Kinsey Goman, Ph.D. suggests collecting a paper or electronic trail of communication when dealing with deception at work. Similarly, keep documentation of the lies that a partner or spouse tells as you may need this evidence during divorce or custody proceedings.
Try an indirect approach at confronting the lie. Graham Scott suggests being tactful and diplomatic so that the other person feels comfortable confessing to the lie. Offer hints that you know the truth, giving the other person a chance to retreat or change her story. Let her know that you question what she is saying, but also acknowledge that you could be wrong or that it might be a misunderstanding.
Be direct in your approach if the person does not admit to the deception -- and if you feel that uncovering the deception is important to the future of your relationship. For example, in a business situation, Kinsey Goman suggests taking a "collaborative approach" and telling the other person that you need only accurate information to meet your business goals.