Why does Fitzgerald stoped Gatsby from having his dream come true?

Fitzgerald may have stopped Gatsby from achieving his dream in the novel "The Great Gatsby" to illustrate the idea that the American Dream is often unattainable and can lead to destructive consequences. By having Gatsby's dream fail, Fitzgerald may be critiquing the idea of materialism and the pursuit of wealth at any cost. Additionally, the tragic ending serves to emphasize the theme of disillusionment and the emptiness of the pursuit of the American Dream.