Learn the tone, meaning, and better English alternatives around "why do you" with real scene examples.

It means the speaker is accusing someone of betrayal and questioning how they could do it so easily.
From The Billionaire’S Vow, Episode 49
The speaker accuses someone of betraying them too easily.
Use this in a serious argument about loyalty or betrayal. It sounds accusatory and emotionally loaded, so it is not polite.
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