Learn what "i knew you would do the right thing" means, when people say it, and how to use it naturally in English.

This means the speaker trusted the other person to make a good decision.
From Married To My Brother’S Ex, Episode 43
The speaker says they believed the other person would do the correct thing.
Use it to show trust, approval, or relief after someone acts well. It is polite and common in everyday speech.
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