My ex-girlfriend messaged me on FB after three years. Should I reply or not?

She did block me three years ago as our break-up was very bad. I hated that bitch and didn't miss her at all.
All of a sudden she unblocked and messaged me on FB. What could be her reason? Should I reply?
I don't even know what to say to be honest.
My ex-girlfriend messaged me on FB after three years. Should I reply or not?
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