Edgar Allan Poe's The Tell-Tale Heart

In Edgar Allan Poe’s The Tell-Tale Heart. The reader is understanding the story through the mind of the protagonist. The protagonist explains how he isn’t “mad” at all for what he has done. He tells about an old man with a vulture eye, how he would ever so quietly go into the old man’s chamber every night to “check” on the evil eye. To one night find the eye open, he explains how he attacked and killed the old man and deposed of the body in the floor. When the police came to investigate he broke out in guilt and confessed to where the old man laid. The central idea of The Tell-Tale Heart, is that even though things seem fine, guilt will always overcome, it will eat the guilty alive.
The story demonstrates the central idea mainly towards the

end of the story where the main character in his mind can hear a ringing in his ear and hears the old man’s heart beating when he’s being questioned by the police. The protagonist is hearing a ringing noise and notices only he can seem to hear it and not the police but feels as if they do and he hears the heart beating getting louder and louder by the minute and then he confesses because he then feels guilty.
The main character is all very internal in his mind and in his actions just as the point of view the story is in. The character changes throughout his story the character seems to develop a fear of this old mans “vulture eye” in-between of telling us what he’d do and to where he kills the man. He confesses in the beginning saying “Its impossible to say how the idea entered my brain…I loved the old man. He had never wronged me…” which tells the reader he changed in days to just have a fear of the eye and not of the man himself, the eye is what haunted him. Then he feels guilty after he’s done killing the old man, “I shrieked, ‘dissemble no more! I admit the deed!... here, here!” the main character confesses after his own guilt comes crawling back to him making him confess. As the character developed the fear of the eye it leads him to kill the old man, then leading him to in the end feel guilty for what he has done connecting to the central idea of even though things seem fine, guilt will always overcome, it will eat the guilty alive.