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'Cheating' is an act of lying, deception, fraud, trickery, imposture, or imposition. Cheating characteristically is employed to create an unfair advantage, usually in one's own interest, and often at the expense of others.[1] Cheating implies the breaking of rules. The term "cheating" is less applicable to the breaking of laws, as illegal activities are referred to by specific legal terminology such as fraud or corruption. Cheating is a primordial economic act: getting more for less, often used when referring to marital infidelity. A person who is guilty of cheating is generally referred to as a cheat (Br. English), or a cheater (Am. English).

With regard to human relationships, couples tend to expect sexual monogamy of each other. If so, then cheating commonly refers to forms of infidelity, particularly adultery.[5] However, there are other divisions of infidelity, which may be emotional. Cheating by thinking of, touching and talking with someone you are attracted to may be equally damaging to one of the parties. Emotional cheating may be correlated to that of emotional abuse, which to date is treated as seriously in a court of law as physical cheating. With the expansion of understanding of other cultures, there is a wide spectrum of what cheating means. When in a committed relationship, the definition of cheating is based on both parties opinions and both parties may redefine their understanding to match the party at an either lower or higher extreme of this definition. Some couples simply believe that cheating constitutes doing anything, whether verbal or physical, that one would not do in front of their significant other. Such examples would include: expressing attraction to another person, electronic communications, kissing, making out, and sexual relations.

Many people consider cheating to be any violation of the mutually agreed-upon rules or boundaries of a relationship, which may or may not include sexual monogamy. For example, in some polyamorous relationships, the concepts of commitment and fidelity do not necessarily hinge on complete sexual or emotional monogamy. Whether polyamorous or monogamous, the boundaries to which people agree vary widely, and sometimes these boundaries evolve within each relationship.

In Short, you have cheated on her in one way or another.