Hi. Would you use dashes as I have done in the speech below or is a comma or dot better?
He knows it's important to you - he understands that - but still you can't expect him to understand that it's more important than him.
That's good, especially if it is dialogue.
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I would probably write it this way.
He knows it's important to you. He understands that. But still you can't expect him to understand that it's more important than him.