Tales from the Crypt (1989)

Season 6: Episode 2

Nelson is a computer genius who is letting his boss take credit for his ideas. Meanwhile his childhood imaginary pal Eddie tries to get Nelson to stand up to his bullying coworker. That is, until Nelson falls in love with a beautiful next door neighbor. Eddie thinks that she will ruin their friendship, but Nelson tosses Eddies' good side out the window leaving Eddie to come back cold-hearted.