How does the author use foreshadowing in Flaubert's Parrot?

In Chapter Seven, we learn a bit more about Geoffrey. He reveals that he did not kill his wife, anticipating that this might be a question the reader would have after he says his wife is dead. Yet, this anticipation also indicates that Geoffrey feels there is the possibility that someone will think he has killed his wife, perhaps indicating that something he did led to his wife's death or that others have questioned him about this. This comment foreshadows Geoffrey's revelations about his wife and their relationship later in the book.