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The narrator has to hide his crime from the police.
A neighbor reported he heard a scream.
From what I can tell from the context, I believe that the narrator is admitting that he is nervous and had been nervous, but denies that he is crazy.
The narrator in "The Tell-Tale Heart" behaves nervously and becomes increasingly agitated as he tries to convince the police of his innocence. He hears the sound of the old man's heart beating under the floorboards, which heightens his anxiety and ultimately leads to him confessing to the murder.
The narrator
In "The Tell-Tale Heart," the narrator becomes increasingly paranoid and anxious in the presence of the police, convinced that they can hear the sound of the old man's heart beating beneath the floorboards. He ultimately confesses by revealing the location of the old man's body, betraying his guilt and mental instability.
Narrator
The narrator in "The Tell-Tale Heart" by Edgar Allan Poe is paranoid because of his guilt stemming from the murder he committed. He becomes increasingly agitated by the sound of the old man's heartbeat, which he perceives as a sign of his guilt. This paranoia drives him to confess his crime to the police.
The narrator keeps insisting that he is not mad in "The Tell-Tale Heart."
The narrator in "The Tell-Tale Heart" smiles after the killing due to his feelings of satisfaction and triumph over the old man's "vulture-eye." He believes he has accomplished the perfect crime and outsmarted the police with his meticulous planning. The smile reflects his distorted sense of accomplishment and lack of guilt.
They have much in common both being unreliable and mad. But to the differences. In the Cask of the Amontillado the narrator is angry and bent on revenge. In the tell-tale heart the narrator is sincere and acts our of paranoia.
In Edgar Allan Poe's "The Tell-Tale Heart," the resolution occurs when the narrator confesses to the police that he murdered the old man and buried his body beneath the floorboards. The narrator's guilt becomes overwhelming as he hears the sound of the old man's heart beating louder and louder, ultimately leading to his confession.