What are character vs character conflicts in The Cask of Amontillado?

In "The Cask of Amontillado," the main character Montresor seeks revenge against Fortunato for an insult. Montresor manipulates Fortunato's pride and ultimately leads him to his death in the catacombs. The conflict between the two characters is driven by Montresor's deception and betrayal of Fortunato's trust.