Learn what "they knew how" means, when people say it, and how to use it naturally in English.

It means other people were aware of his strong concern or affection for both people.
From Undercovered Heart, Episode 29
Someone is explaining that others understood how much a man cared about both of them.
Use this to explain how others perceived someone’s care or loyalty. The sentence is understandable, but it is fairly context-dependent and not a strong standalone query.
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