In the world of dreams the rules of reality do not necessarily apply. Each dream is unique and it's a direct link to the soul and spirit. Psychology provides its own theories on what dreams mean, but so did tradition and the study of dreams for thousands of years before any relevant science had developed.
Dream Meanings - Deceipt
If you dream you are being deceived then you will have good luck, but if you deceive someone you will have success in anything you do. If, however, you are a woman and you see your partner cheat on you, then expect arguments and problems in your relationship.