If nothing else, this moment of desire makes Nick seem more human. He has needs and longings, just as everyone does. In addition, his agreeing to help Gatsby reunite with Daisy suggests he, too, has a bit of the romantic about him. His morality isn’t as rigid as may have been initially supposed; these small acts of human nature help warm the reader to an otherwise aloof man. This release of passion, too, marks a turning point for Nick. From this time, he is open to change and susceptible to the feeling and emotions that many other characters (especially Tom, and to a large extent Daisy and Jordan) work diligently to keep out.
