Poe's extensive use of dashes in the last two paragraphs is effective because it in the story tell tale heart

After thea elvsted leaves the room, crushed by lovborg’s statement that he had destroyed the manuscript, he says to hedda, “to you i can tell the truth, hedda.” why does he think he can tell hedda the truth? do you think he’s right in this statement? why or why not? your answer should be at least one hundred words.