The Ending of Fight Club

In the end of Fight Club a series of explosives go off, destructing the city below.  I think the destruction symbolizes the death of Tyler Durden. The buildings that crumble to the ground represent the narrator finally “hitting rock bottom”.  At the end of the film, where the narrator stands with Marla watching the buildings crumble, I think represents the narrator as being “cured”.  After the gunshot, the narrator has become a different person. Tyler is no longer the narrator’s alter ego and he stops avoiding his feelings for Marla.