Is it wrong not to attend a funeral of an ex if they treated you so badly?

I saw my ex’s mom and she told me he just passed Thursday and they were making arrangements and she would like me to come and you know to pay respects. But the thing is her son treated me so badly. Physically and emotionally. She doesn’t know these things but I don’t know how to say no to her. I don’t want to tell her because of his passing and want her to just have good memories of her son. Idk what to do

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