
die Untreue
infidelity
The breaking of sexual or emotional faithfulness in a relationship; adultery or cheating.
Er konnte ihr die Untreue nicht verzeihen und trennte sich von ihr.
He could not forgive her infidelity and broke up with her.
infidelity / breach of trust
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infidelity
The breaking of sexual or emotional faithfulness in a relationship; adultery or cheating.
Er konnte ihr die Untreue nicht verzeihen und trennte sich von ihr.
He could not forgive her infidelity and broke up with her.

breach of trust
A legal term for a criminal offense in which someone abuses asset management entrusted to them and thereby causes financial damage.
Der Geschäftsführer wurde wegen Untreue in Millionenhöhe angeklagt.
The managing director was charged with breach of trust involving millions.

disloyalty
In a general sense, disloyalty or a lack of devotion toward a person, cause, or principle.
Die Partei warf ihm politische Untreue vor, nachdem er seine Meinung öffentlich geändert hatte.
The party accused him of political disloyalty after he publicly changed his opinion.
The word 'Untreue' consists of the prefix 'un-' and the noun 'Treue' (loyalty, devotion). So it literally means a lack of faithfulness or loyalty.
Sein Verrat wurde als ein Akt der Untreue gesehen.
His betrayal was seen as an act of disloyalty.
Pay attention to the context to recognize the meaning. If it is about relationships, 'Untreue' (infidelity, m01) is meant. If it is about finances and law, the legal term (m02) is meant.
Ihre Beziehung zerbrach an seiner Untreue.
Their relationship fell apart because of his infidelity.
In the context of relationships, 'Untreue' is often used with certain verbs: one can 'Untreue begehen' (commit infidelity), 'gestehen' (confess), or 'verzeihen' (forgive) someone for it.
Er hat ihr seine Untreue nach vielen Jahren gestanden.
He confessed his infidelity to her after many years.
In the meaning of misusing entrusted assets, 'Untreue' is a legal technical term. You therefore often find the word in news reports about white-collar crime.
Dem Politiker wird Untreue im Amt vorgeworfen.
The politician is accused of breach of trust in office.
fraud / cheating
In the case of a secret affair, both words can refer to a breach of trust in a relationship. „Untreue“ focuses on breaking sexual or emotional faithfulness, whereas „Betrug“ more strongly emphasizes deliberately deceiving one’s partner. Choose „Untreue“ for the violation of faithfulness and „Betrug“ for the deception.

Für sie war seine Untreue besonders schlimm, weil er eine heimliche Affäre hatte.
His infidelity was especially painful for her because he was having a secret affair.
Für sie war sein Betrug besonders schlimm, weil er die Affäre lange verheimlicht hatte.
His cheating was especially painful for her because he had kept the affair secret for a long time.