Fighting A Bully?

I am Bulled for Like 5 years.
The bully Said that we can fight. And if I donโ€™t accept the challenge He is gonna tell the whole school that iโ€™m scared. I do for Like 9 years teakwondo and i am A black belt. Only my friends know that and the bully doesn't know that. But I also donโ€™t know A lot about the bully.

Should I accept it
And how do I have to act? Direct all in or something Els?
Fighting A Bully?
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