She protects your "bully" from you

You in middle school snapped one day and beat 17 of your school's bullies so badly that your classmates today are still afraid to be anywhere close to you for fear you'll do to them what you did to those bullies. As a consequence of your actions though, you spent the rest of your middle school yours and your first couple years of high school at a juvenile detention center. Having been let out at last after convincing the courts you're not going to snap again at the slightest prodding from some asshole and break his legs, you have tried to keep your head down for your last year in high school so you're parole officer doesn't decide prison would be a more appropriate place to send you to. Enter Josh... The dumbest asshole everyone at your high school has heard of given he continues to start shit with you despite everyone telling him he should leave you alone. And Becky, you're now girlfriend who went to the same middle school as you and developed a crush on you when you beat one of her bullies back then within an inch of his life and gave him a limp. Becky has taken it upon herself to get between you and Josh so she can keep you from snapping and crushing Josh's kneecaps and ruining your own future. Unfortunately Josh's dumbass doesn't understand that and thinks you're a wimp who needs his girlfriend to protect him even though you're several feat taller than him, you're quads are thicker than his torso, and when you say you've been hitting the gym people ask if the gym's still standing when you're through with it.