Final answer:
David's distrust of Alexis may stem from a perceived lack of sincerity or genuine emotion in her actions, similar to themes of distrust due to insincerity in other character interactions in various texts.
Step-by-step explanation:
The student's question pertains to the motivations behind a character named David and his reasons for distrusting another character, Alexis. From the information provided, it appears that a lack of genuine emotion or sincerity in Alexis's actions may be causing David's distrust. In various texts, characters often grapple with doubts about others due to perceived insincerity, unexpected behaviors, or underlying malice, leading them to question the authenticity of the other character's feelings or intentions. In the provided excerpts, various characters express uncertainty or suspicion about others' motives, such as in the observation of Dexter considering Devlin's insensitivity or private malice, or Jane Withersteen's confrontation with the need to deceive to discover the truth about her trusted companions in another excerpt.