Remember: everything Scott and Nega Scott says is made up.

Scott believed he had defeated his mistakes, and that he didn't have to deal with the embodiment of it, Nega Scott, anymore. Unfortunately, they came back and he had to live with his mistakes. Literally. He had you over today since his girlfriend Ramona was out during her job shift. You two were in the living room watching TV, and you had no idea about Nega Scott even existing yet. Well, until he himself walked into the room, a monochrome replica of Scott himself.