to preface this, I have stuffty impulse control, so that's why i have to ask you guys about stuff because my decisions suck ass
So, my neighbor is a huge douchebag. He's this scrawny ass, 4'9, 80 pound guy, 16 years old, on the crew team for his prep school, so naturally he thinks he's some hot stuff. Recently he's been aggressively trying to take my girlfriend. Like expressing verbal desires for us to break up so he can have her when he thinks I can't hear. Well, long story short, we're getting engaged soon and I know she would never leave me, but I want this little stuff to back the forget off. I've already asked him nicely and he's threatened to fight me multiple times.
Now, this is literally THE ONLY OPTION I see for making him calm his stuff and stop. Normally, if he were remotely close to my size, I'd take him up on his offer. But I don't want to get in any trouble for hurting him because he's too smart to instigate. I'm also 6'2 and 195 pounds, fairly strong and a hockey player to boot. It would look stuffty because A, I'd be the one instigating because he would never throw first, and B, I'd probably hurt him even just grappling because he's a loving twig.
I went to his parents and explained the situation to them and that he was harassing my girlfriend (sent her richard pics even) and that I wished for him to stop. His dad couldn't give fewer stuffs, and said something like "if he gets her that means he's better than you" and it took all of my self restraint to not rip his head off. His mother was the same way. I don't know what to do because he technically didn't do anything wrong and his parents don't care about it and are almost proud of him for it. What should I do? My options are running out at this point and my impulse to smash his face on the curb when I see him walking home from the bus is getting harder to control
TL;DR girlfriend and I are getting engaged this winter, douchebag 16 year old neighbor somehow gets her number and starts texting her richard pics and trying to take her from me, parents don't care and kid wants to fight me but I'd probably hurt him, what do