The quote reflects a deep yearning for a simpler, more uncomplicated relationship between the narrator and Jacob. The desire for a sibling bond suggests an earnest wish for love that is free from complications, misunderstandings, or emotional turmoil. This longing points to the complexities of their current relationship, which is laden with romantic tension and the pain that often accompanies such feelings.

In essence, the narrator's wish for Jacob to be her brother symbolizes a longing for a connection that is purely affectionate and devoid of the challenges that love can bring. It highlights the struggles of navigating relationships where emotions are intertwined, emphasizing the importance of clarity and simplicity in love. This sentiment resonates universally, as many people often wish for relationships that allow for open, genuine affection without the weight of romantic entanglements.