How Was Montresor Insulted in ‘The Cask of Amontillado’?

In Edgar Allan Poe’s short story ‘The Cask of Amontillado,’ Montresor claims that he was insulted by Fortunato. However, the exact nature of the insult is never explicitly stated in the story. Montresor only mentions that Fortunato had caused him a ‘thousand injuries’ and that he had borne them as best he could, but when Fortunato ventured upon insult, Montresor vowed revenge. This suggests that the insult was significant enough to push Montresor over the edge, leading him to plot and execute a gruesome revenge against Fortunato. The lack of specific details about the insult adds to the story’s mystery and leaves readers to speculate about what might have driven Montresor to such extreme measures.