¿Cómo se dice "know better" en español?
Me refiero a cuando dice "She knows better".La frase que quería traducir era: Don't you know better? Hearts are breakable and I think even when you heal you are never what you were before.

Question

¿Cómo se dice "know better" en español?
Me refiero a cuando dice "She knows better".La frase que quería traducir era: Don't you know better? Hearts are breakable and I think even when you heal you are never what you were before.

Answer

know better = conocer mejor

But in a phrase should be more easy for understand

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"conocer mejor" 
if you give me an example or the full sentence i could translate it.

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difficult to translate that in the English speaking sense, but the closest would be

¡ya sabes tú!

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would be nice if you provide an example or context where the 'know better' is used in english to help you with the translation.
However, it should be: conocer mejor

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conocer better?  no estoy seguro.