You can do this: What he has done / did to you is unforgiveable. What he did to you was/is unforgiveable.
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Mister MicawberYou can do this:Thanks MM,
What he has done / did to you is unforgiveable.
What he did to you was/is unforgiveable.
Mister MicawberThere is no such thing as a 'past particle' and no one but you wrote 'has did'.Typo and misread...