"At length I would be avenged; this was a point definitely, settled..."See in text(The Cask of Amontillado)
This suggests that Montresor had plenty of time to plan and refine his entrapment scheme and to create the impression that he and Fortunato are very good friends. Notice how he refers to the man he hates as "my friend," "my good friend," and "my poor friend" throughout the tale. It seems probable that Montresor does this out of foresight—for, when Fortunato disappears, it is unlikely that anyone will suspect his friends of having anything to do with it. Montresor may even make earnest inquiries about Fortunato after he goes missing.
