The Cask of Amontillado

I didn't find this short story to be as dark as previously suggested by the content page. To me, I find similarities between this story and Othello. As both consist of a betrayal and an attempt on a friends life. In this story, Montresor plans to enact revenge on his friend Fortunato for insulting him. One thing I would've liked to know is how exactly Fortunato insulted Montresor to where Montresor would attempt to take the life of his acquaintance. Visualization for this story was made easy by the talks of Carnival to help picture a setting and understand surroundings as well as the small, four walled crypt that Montresor lead Fortunato into where bones lined the walls. I personally enjoyed reading this as it was easy to follow and there weren't many instances where I got stuck on a certain part of the story. It would've been helpful to know how Fortunato insulted Montresor as well as an exact setting for the story as the place where it takes place is vague outside of knowing that it's carnival season.