Final answer:
Gatsby's concern in 'The Great Gatsby' is likely about Daisy Buchanan, demonstrating his inability to make her understand his feelings and perspective.
Step-by-step explanation:
The dialogue you referenced is from 'The Great Gatsby' by F. Scott Fitzgerald. In the given context, Gatsby is expressing his frustration to the narrator, Nick Carraway, about not being able to make someone understand.
Although the exact person is not mentioned in your question, it is most likely that Gatsby is referring to Daisy Buchanan, the love of his life, whom he has been trying to win back.
Fitzgerald portrays Gatsby's deep concerns and the limitations of our abilities to make others understand our perspectives and feelings. The narrative explores themes like the hollowness of the American Dream and the isolation of individuals within society.
Nick remains at the party until its conclusion. Engaging in conversation with Gatsby, the latter expresses concern about being unable to make "her" understand. The unidentified "her" adds an air of mystery, prompting curiosity about Gatsby's personal relationships and the complexities he faces.
This brief glimpse into Gatsby's emotional struggle hints at deeper narratives within the storyline, enticing readers to explore the nuances of characters and their connections. The use of the pronoun "her" introduces an element of ambiguity, inviting speculation about Gatsby's sentiments and the potential challenges he encounters in trying to convey his thoughts or emotions to this particular individual.