Final answer:
The text excerpts provided do not specify a particular phrase that Dexter repeatedly says due to a tic. Instead, they focus on his life experiences and emotional reactions to the events and people around him.
Step-by-step explanation:
The student's inquiry pertains to a tic or repeated saying by the character Dexter in a work of literature. Unfortunately, the provided excerpts from the text do not explicitly mention a specific phrase Dexter repeatedly says due to a tic, and therefore, we cannot pinpoint exactly what Dexter kept saying.
The excerpts provided focus on moments from Dexter's life, his emotions, and interactions with other characters, including moments of reflection, decision-making, and personal relationships. Dexter is characterized by his dreams and aspirations, the impact of his social environment, and his complex emotions towards events and people in his life, especially Judy Jones.