Leave my loneliness unbroken

Leave me the fuck alone. Don't try to console, or help me through a time of loss. Go away.

Company is unwelcome at this time.

From Edgar Allan Poe's poem "The Raven".

Neighbor one: Who's the guy with the sign over his door that says "Leave my loneliness unbroken"?

Neighbor two: Oh, that's Josh, he's naturally anti-social, but ever since he lost his girl he's really shut the world out.