cheat on (someone)

Translations
изменять (кому-то)
Someone found out that their partner was cheating on them.
Кто-то узнал, что его партнер изменял ему.
Definitions
To engage in a romantic or sexual relationship with someone other than one's partner, typically without the partner's knowledge or consent.
Words
cheat

verb
изменять
on

preposition
с
someone

pronoun
кем то