A Tell-Tale Heart Response

So I love this story. It's very weird. The point of view is from the murderer. And i think this shows what went through his mind the whole time. If the police told the story they would just say well he confessed randomly. The old man really doesnt play a huge role in this story. We know that he has this crazy blue eye and that he was fairly nice to this other guy. thats about it. The only thing that trips up the main character is that his own guilt comes back to make him confess. He felt so bad that the heart kept beating louder and louder and his own fear of getting caught was the real reason he confessed. The police dont know this guy and have no idea what is going through his mind. They just think he might be having a bad day or thats how he talks. They really dont know so thats why they keep having these casual convos with him.