Learn the tone, meaning, and better English alternatives around "she's cheating on mason with his friend" with real scene examples.

It means the speaker is accusing someone of having an affair with their partner's friend.
From Help! I’m Falling In Love With My Rude CEO, Episode 16
Someone accuses a woman of cheating with another man's friend.
Use this only when accusing someone of cheating, because it is very direct and inflammatory. It is not polite and will usually escalate conflict.
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