Another guy is hitting on my girlfriend and I'm having trouble containing my urge to kill him.
I'm in a very vanilla relationship, which is something that suits both me and my girlfriend very well. We love each other very much, and plan on moving in together very soon.
And then there is this guy, sorta mutual "friend", that we often bump into on parties and shit. He's the definition of a Chad, muscular, cocky, et cetera. He hits on many "taken" girls quite often, and recently noticed that I also have a girlfriend. So far he's only talking shit, implying he's going to so-and-so fuck her. I never thought that anything like that would have any effect on me. I was wrong.
He never laid a finger on her, if he did, I would probably outright kill the fucker (already fought him once in the past and won), but she is feeling uneasy around him (She has mild haphephobia, and usually feels frightened when touched by anyone, with the exception being me and some close friends.) This is where it gets hard. I have never in my life despised anyone as much as this guy. The moment I lay my eyes on him, I'm immediately flooded by blind rage and urge to kill. It's quite frightening for me, because he hasn't really done anything yet, and I know that resorting to violence isn't going to bring anything good, but it's getting increasingly difficult to contain myself around this degenerate. I find myself anticipating the moment when he makes a move, just so I would have any excuse for murder.
More and more often my mind starts producing images of him raping my girlfriend, which fuels my rage even more. What is wrong with me? Is this a manifestation of some cuckold fantasy I've never known I had, or is it genuine hatred? I feel like a horrible person, because deep down I want him to violate and abuse her, so that I could retaliate with clear conscience. I have never had any anger issues or anything like that. This is the first time I've hated anyone so much.
TL;DR I want to kill a guy for saying some mean shit to my girlfriend