My girlfriend is cheating on me... What's the best way to get back at her?

My friend took pictures and videos of her all up on this guy but she doesn't know that i know about this... Even her homeroom teacher says he has my back if i get in trouble for getting payback but the thing is i don't know what's a good payback... Anyway ideas because summer school is next Monday...
My girlfriend is cheating on me... What's the best way to get back at her?
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