If you didn't say I was a bad wine tatster this never would have happened.
In this scene fortunato insults the narrator. The narrator is so mad that he plans to kill fortunato.
In this scene the narrator leads him to the amontillado. Fortunato is drunk and follows the narrator even though Fortunato doesn't know where he is at.
In this final scene the narrator takes fortunato to the wine. While fortunato is picking out the wine he wants, the narrator makes a wall and fortunato can't get out. Then the narrator leaves him there to die.