What is the most likely reason Poe has montresor reapeat the line I have my doubts to fortunato?

Poe has Montresor repeat the line "I have my doubts" to Fortunato to create tension and foreshadow the impending betrayal. It also highlights Montresor's cunning and manipulative nature as he lures Fortunato deeper into his trap. By emphasizing this line, Poe builds suspense and hints at the underlying deceit in their relationship.