True!--nervous--very, very dreadfully nervous I had been and am; but why will you say that I am mad?
The narrator is denying that he is mad, he says that he was only nervous.
I think it was his eye! yes, it was this! Whenever it fell upon me, my blood ran cold
The narrator planned to kill the old man because of his vulture's eye.
For seven nights the narrator watched the old man sleep at midnight.
Then on the 8th night, he saw his eye so he killed the old man. The narrator kills the old man by putting the heavy bed on top of him.
I then replaced the boards so cleverly, so cunningly, that no human eye -- not even his -- could have detected anything wrong. There was nothing to wash out -- no stains of any kind -- no blood-spot whatever. ha! ha!
He is about to dismember the old man. Suddenly he gets a know on his door, it was the police but he wasn't worried because there was no stain of blood anywhere. The police started questioning him but all he could hear was his heartbeat that kept getting louder and louder because he was guilty and nervous.
The narrator confessed to the cops, that he killed the old man, he shows them where he hid the old man's body
I confess. I confess. I killed the old man. Move those panels and look here.