A guy supposed to be a friend spanked me without my consent (being a bit drunk) in an empty street…how should I react?

I m really mad about this.

He did it in a dark street close to my home (he is used to accompany me at night on a regular basis).

he was interested in me but I told him I was not interested. He seems he doesn’t accept it…

A guy supposed to be a friend spanked me without my consent (being a bit drunk) in an empty street…how should I react?
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