How to say "to change, to be unfaithful" in Russian?

Изменять

"to change, to be unfaithful" is Изменять in Russian.

Изменять means "to change, to be unfaithful" in English.

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Word #2710 of 4,000 by frequency in Russian — level B2.

Example

Она узнала, что муж начал ей изменять.

She found out her husband started being unfaithful to her.