If a boyfriend tried to hit her (she blocks it), it's over right?

Anonymous
My sister's boyfriend tried to slap her during an argument. She applied what she learned long ago. She intercepted it before it even had a chance to reach her face. This shocked him. Fortunately she knows self-defense.

She broke up and he's been begging her. She still cares for him but Is wondering if it's over for good or should be given final/last chance? Even if a girl can defend herself, isn't an attempted hit enough to call it quit?
If a boyfriend tried to hit her (she blocks it), it's over right?
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