"If you ever hit me again, I'll have you arrested so fast your head will spin."
In the meantime, take some pictures of yourself in your current condition, have them printed, and give them to a trusted friend with the instructions that they can never be given back to you, and can only be sent to the police on your instructions.
You need a witness to the fact that he has hurt you, for when (not "if") he does it again, as he will.

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