What did the main character do in the story? How did they contribute to the conflict?

In this story, the main character (the narrator) murders the old man with whom he lives. After committing the murder, he buries the body under the floorboards. However, the narrator is taunted by the sound of the old man's beating heart and rips up the floorboards, revealing to the police what he has done.
In terms of conflict, the main character actually creates it. Because of his mental instability, the narrator convinces himself that the old man has an "evil eye" which taunts him day and night. The narrator believes that the only way to rid himself of this evil eye is to kill the old man. It is this situation which creates the story's main conflict.
Later in the story, the narrator is conflicted again when he hears the sound of the old man's beating heart. To resolve this conflict, he rips up the floorboards to reveal the body. However, in doing this, he creates a new conflict because the police now know that he is guilty of murder.