To dream of infidelity (either by you or someone else) represents issues of abandonment and neglect in a relationship. Or you are feeling emotionally confined and need an outlet for your feelings. Alternatively, a dream of infidelity indicates that you are feeling unsatisfied with your current relationship. You are harboring guilt over a sexual relationship or you are looking for a more erotic sex life.
***Go to Common Dreams: Cheating Dreams for further analysis.