In "The Cask of Amontillado" why does Montressor keep giving Fortunato chances to leave? He wants to kill Fortunato, doesn't he?

Montresor may be using reverse psychology in urging Fortunato to turn back, but he has another reason for doing so. Reverse psychology, so-called, plays upon the natural human tendency to do the opposite of what is recommended. This is especially observable in people who are heavily intoxicated. If told that they have had enough to drink, they will order another one. If told they should let somebody drive them home, they will insist on driving their car home by themselves. Reverse psychology may be hard to understand, but it is certainly easy to observe because it is so common.

However, Montresor is much more concerned about something other than using reverse psychology to lure Fortunato to his death. Montresor is leading the drunken man deep underground into a dark, dank, poisonous atmosphere. He doesn't want Fortunato to become suspicious or alarmed. By constantly telling his victim that they ought to turn back, Montresor is demonstrating that he has no evil intentions. He makes it seem as if he really doesn't want to take Fortunato to the place where he has stored the Amontillado. If he had any sinister motives, why would he keep urging Fortunato to go back upstairs? Montresor has been playing the naive innocent all along. He keeps up the pretence of pure innocence until the last moment.