It looks like a comma is not needed in this case; but its hard to tell without a context.
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SoorisDo we use a comma after 'but'?But, he never hurt (hurts, not hurt) her.
Ex. But, he never hurt her.
J LewisHe hurt is not wrong; it's the past tense.I believe the sentence is in the present tense.
J LewisCertainly we need more information to understand whether it's a correct past or an incorrect present, but there's no reason why "never" can't be used in the past: Edgar Rice Burroughs, author of Tarzan, never visited Africa.
During their life together (now finished) he never hurt her.
I never visited