This could be a metaphor for someone who had a catastrophic loss of someone important to them, whether by death or breakup. The fire is the event that culminated in this loss, the people rushing for the door are the fair-weather friends who fled the drama of it all, the burned-out building is the remains of the relationship that was, and the ghost is, ironically, the living person left behind in that wreckage of a relationship that's still very real and dear and present to them, even as that other person and their mutual friends are all already long departed.
This could be a metaphor for someone who had a catastrophic loss of someone important to them, whether by death or breakup. The fire is the event that culminated in this loss, the people rushing for the door are the fair-weather friends who fled the drama of it all, the burned-out building is the remains of the relationship that was, and the ghost is, ironically, the living person left behind in that wreckage of a relationship that's still very real and dear and present to them, even as that other person and their mutual friends are all already long departed.