Initially, Nick is drawn to Gatsby's mysterious nature and his ability to throw extravagant parties. He is intrigued by Gatsby's wealth and social status, and he admires Gatsby's pursuit of Daisy Buchanan, the woman he loves. However, as the novel progresses, Nick learns more about Gatsby's past and the questionable means by which he has acquired his wealth. He becomes increasingly disillusioned with Gatsby's character and begins to see him as a tragic figure.
Nick is critical of Gatsby's dishonesty and his willingness to deceive others in order to achieve his goals. He is also bothered by Gatsby's obsession with Daisy and his inability to move on from the past. Nick believes that Gatsby's pursuit of Daisy is ultimately destructive, both for Gatsby himself and for those around him.
Despite his criticisms, Nick ultimately develops a deep affection for Gatsby. He recognizes Gatsby's essential decency and his capacity for love and compassion. Nick is moved by Gatsby's dream of a better life, and he sympathizes with his desire for happiness.
In the end, Nick is left with a sense of loss and regret after Gatsby's death. He mourns the loss of a man he has come to admire and respect, even while acknowledging Gatsby's flaws and the tragic nature of his life.