He’s going to leave then. They’re like fairies…if you stop believing in them, they leave the house.
Start commanding him to leave and not come back in the name of Christ (tends to be quite effective)…and then never acknowledge his existence. Then when you don’t feel him (he’s still there probably)…say out loud smth like “what was I thinking about ghosts don’t exist” and gaslight that mofo out of existence xD