Why might montresor have desides to confide in his unidentified listener?

Montresor may have confided in his unidentified listener because he wanted to boast of his crime and revel in his triumph over Fortunato. By revealing the details of his plan, he may have also been seeking validation or recognition for his cunning and deceitful actions. Additionally, sharing the story with someone allows Montresor to unburden himself of his guilt and relive the experience for his own satisfaction.