Infidelity and cheating or being cheated by partner* are qualified as Adultery. Use same conditions for cheating as for adultery and apply meanings accordingly.

Quick and Clear:

Most popular explanation, which consists of most common meanings and interpretations about adultery in dreams

• If you dream that you commit adultery or cheating on someone, this is a sign of you not being honest with yourself. Maybe there are some things in your life you can not admit to yourself and hiding the feelings deep down inside of you.
• Dreaming of an adultery also could be a sign of you being invoked into something against the law.
• If you see your partner or your friend cheating on you, this is a sign that you are afraid of being neglected by the ones you love. You should consider, as there might be something missing in the relationships you are having, that why you are having those fears. What you should do is not humble yourself down.
• If you dream of cheating on your partner with his friend, this is a sign that there are changes that has to be done in your relationship with your partner, as you feel unappreciated. You might reveal something about your partner you will not like.

In general:

An adultery in sleep can be a nightmare or a regular dream. Everyone dream at least once about being unfaithful.

When the dreamer appears in his dream as an adulterer or an adulteress, then such dream is a sign of his or her desire to change something in marriage or in relationship. But dreaming of adultery, being an cheater, can also reveal anger and fear in his soul.

The dream about others, who commit adultery, is probably the indication that the dreamer is not in the affair. But such dream might be a sign that there is some dirt in the dreamer’s life.

Psychologically:

Dreaming of voluntary sexual intercourse between a married person and a partner other than spouse might be induced by wishful conscious thinking. Such dream, in which the dreamer is committing or living in adultery or bigamy, is most likely to occur for people who are unsatisfied of marriage in an emotional and a sexual aspects.

The atmosphere of the dream is important. Even if the adultery was committed only in the mind of dreaming person, still it may cause the sense of guilt.

The dream about adultery is also a chance to experience of your own, true feelings in case of real adultery. Dreaming about a fornication or an adultery will let you know how would you feel in case of being unfaithful and what the consequences of adultery is.

Traditionally:

European (Judeo-Christian)

• Adultery in general – Adultery, infidelity or cheating of your partner in general: brings dishonor and shame;
  • Other interpretation in same condition: means the desire for a fling or a bad conscience for committing unfaithful act;
• Adultery with guiltiness – If an adultery in dream creates feelings of guilt because of cheating: means failure;
• Man is cheating – For men to dream that he is committing an adultery: he might go on trial in court for an illegal action;
• Woman is cheating – For women to dream that she commit an adultery: she will not be able to get the affection of the man, because she let’s her temper by the slightest provocation become an anger;
• Woman is cheating with friend – For women to dream that she has a relationship with the friend of her man: her husband is not wrong;
• Woman is cheating with young man – For woman to dream that a young person made her to commit adultery: she is in the risk of being abandoned;
• Dreaming that partner is cheating - To dream that partner is unfaithful: means a happy marriage.

Arabian (Islamic)

• To commit adultery in dream, to make it by yourself: indicates possibility of fire hazard; loss of belongings.

M. Ibn Sirin dreambook:

Islamic dream meanings and interpretations about an Adultery by Muslim interpreter of dreams Muhammad Ibn Sirin

Adultery meaning in Islam Source: Strong
(Meaning of dream: Condition in dream)

• Betrayal in general: Dreaming about committing the exceptionally bad and forbidden act of adultery means betrayal. If the dreamer sees himself doing so in a dream, it means that he will betray his partner*. An unknown woman is better in such dream than a known woman.
• Theft in other hand: Adultery in a dream also can represent theft.
• Unlawful money if adulteress is persuading : Dreaming about an adulteress which soliciting the dreamer for fornication means that he might be tempted to earn money in illegal way.
• Safe money if young woman in dream : If the dreamer commits adultery with a young and a beautiful woman, it means that he will place his earnings in safe place or a coffer.
• Bigger authority for strong man: If a powerful person performs adultery in his dream and if he had to face the divine ordinance and chastisement for his sin in the dream, it means that his authority will become bigger.
• Money from husband of adulteress: If the dreamer committing adultery with the wife of a friend in a dream it means that he will take some money from this friend.
• Adulterer himself or adulteress herself if dreaming of reading the Quranic verse: If the dreamer reads the ruling of the divine ordinance concerning the punishment of adulterers in a dream, it means that he is an adulterer.
• Adulterer himself or adulteress herself: If the dreamer marries an adulteress or an adulterer in a dream, it means that the dreamer is an adulterer or adulteress.
• Wisdom and knowledge for student to dream adulteress: If a student on the path of Allah Almighty, who is known to have piety, good conduct and who has the look of a believer sees himself dealing with an adulteress or a woman who has committed adultery in a dream, it means that he will join the company of a Gnostic and learn wisdom at his hand.
• Worldly interests if others committing adultery: If the dreamer sees a man and a woman sitting alone in an intimate setting in his dream, and if he recognizes them, it means that the dreamer desires some worldly interests from such a man.
• Safe savings: If the dreamer sees himself raping a young woman in a dream, it means that he hides his savings in an unknown place.
• Path of knowledge: If the dreamer is caught after an adultery, and if the divine ordinance is exacted in the dream, his dream means that he will follow the path of knowledge and understanding of religious jurisprudence.
• Severe trials: If the dreamer performs adultery with an adulteress in a dream, it means that he will encounter severe trials.
• Possibility of death: If the dreamer enters a brothel and can’t find the way back and it’s impossible to leave that place, then such dream shows small possibility that he may die shortly.
• Trust: If the dreamer is sleeping with someone else’s wife, while the husband of her is not showing in a dream, means that her husband will entrust the dreamer with his home to manage.

* Please, see meaning of marriage, divorce, sexual intercourse.

* Partner stands for boyfriend or girlfriend, husband or wife, fiancé or fiancée, spouse or just friends with benefits.