My ex (the dumper) wishes me (dumpee) "Happy Birthday" a month after our breakup and no contact, also on a wrong day, Reply or no reply?

He did not even say GOODBYE to me and now he wishes me "happy birthday" two days late!
My ex (the dumper) wishes me (dumpee) "Happy Birthday" a month after our breakup and no contact, also on a wrong day, Reply or no reply?
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