Fortunato could be experiencing a combination of shock and anger at the conclusion. He's stunned by the betrayal and furious at his own naivety.
Maybe Fortunato laughs out of shock or a sense of irony. It might also be a sign of his inability to fully comprehend the situation he's in.
Fortunato met a tragic end. He was walled up alive by the narrator.
Fortunato meets a tragic end. He is left trapped and ultimately dies in a dark and damp place.
Fortunato ends up being confined in a remote corner of the catacombs, left to his fate. There's no way out for him, and he's essentially trapped in a hopeless situation.
Jealousy is a very common emotion. Feeling that someone else has invaded what you thought was your exclusive relationship can stir up intense jealousy. Also, there's often a sense of betrayal, like your partner has broken an unspoken pact. And there can be confusion as you try to figure out how this could have happened.
Sadness is very common. After all, a marriage is a significant bond, and its end means the breakdown of that connection. There could also be a sense of relief. Maybe the relationship had become very difficult or toxic, and the end is like a release from that stress.
Nervousness. Since they might be worried about how others will react, whether they will face judgment or not. For example, in a more conservative area, they may be extra cautious.
Fortunato's motivation seems to be his pride and his desire to prove his expertise in wine.
The timing isn't clearly stated. However, one could infer that it's been long enough for Montresor to have composed his thoughts and perhaps feel less immediate guilt or remorse.
The name Fortunato is significant as it creates a contrast between what one might expect from the name and the character's fate. It also helps build suspense and mystery throughout the story.