I'm sorry that you're having this problem, and my response may sound like I don't understand, but I really do. So read it as if I'm on your side, and maybe you'll see the point I'm trying to make. First off, even if you can kick the guy's ass, please don't.In addition to the fact that violence is never a good solution, it will also likely get you in a bunch of trouble, and quite frankly, it doesn't sound like you need more problems right now.
Also, as far as "stealing your girl" goes, I know what you mean by that, but she's not an object, so he didn't really "steal" her. If she chose to be with him, then I assume that's what she wanted. She has a mind of her own, and as much as it might suck for you, it's not really something you can control.
Okay, now I know you're not going to want to hear this next part, but there is a reason that they say "the best revenge is living well," and that is because it's true. What I mean is this, forget about the idea of revenge, and just focus on what you can do for yourself to move past this whole thing and get back to being happy. Even though I know you probably feel crappy right now, I really think you'll feel better if you focus on more positive things than on trying to get back at this guy.
Best, --mcloudy P.S. I forgot to address the pushing thing, which is a little more tricky. But, since you said you could kick this guy's ass, I assume he isn't going to be doing a lot more of that. Try to rise above it if you can, and hopefully if you distance yourself from the whole situation, it isn't going to happen again anyway.
If it does continue, and you think there could be real violence on either end, then you probably need to discuss this with an adult you trust.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.