Learn what "some secrets are best left in the past" means, when people say it, and how to use it naturally in English.

This means the speaker thinks it is better not to revisit old secrets or old problems.
From Mysterious Murderer, Episode 4
The speaker is warning that some information should stay hidden or not be brought up again.
Use it when you want to discourage someone from digging up the past. It can sound cold or evasive if used in a tense conversation.
Scenes unlock real expressions as you watch
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