Dream About Abandoned City Friends Ruining World

I was standing there in a abandoned burnt down city. The sky dark from ash as there is some small fires still going. My loved ones dead at my feet. Everyone was dead. The world was dying. I looked up and saw something standing ontop of a city building very high up. I recognized them from another dream. In that old dream me and him where best friends. It was one of those dreams where I was running and hiding from something and he was right next to me during the entire thing. He kept me calm so the dream didn't become a nightmare. Years later he is in another dream being the one standing ontop of the building. He slowly pointed a sword at me. He did all of this for me. He ruined the world for me so it was just us because it used to be always us.