Things Fall Apart

You could see the ending of the novel as things falling apart in the sense that old ways are being destroyed and broken. Perhaps "falling apart" simply means coming apart so something new can form; a second coming one might say. Things falling apart signifies a new era in the society of Umuofia. When Okonkwo was exiled, he came back to a place of change. At the end when he commits suicide, perhaps this signifies that Umuofia can finally enter that new era through a great transformation.