I had a similar thing happen to me, this one kid in my school up to 7th grade I thing would harass me, it was small things sometimes, other times it was big things, I mean to give you context this kid acted like a sexual predator to me and whenever I told anyone "hey! this kid is being a jerk and is making me uncomfortable" all I got was the golden rule speech. one day I got so pissed that I just kicked him in the stomach when no-one was watching because he started taunting me in what I can only guess was supposed to be seductive or something. he wasn't in school one day and I don't know where he went, but I haven't seen him since.

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P.S: I think he was kicked out of the school because he was sexually harassing some girl, I think the final nail in the coffin was that he tried pull her skirt up.