Unrequited love is greatly portrayed in The Great Gatsby. This kind of love is shown through many different characters, each in different ways. "Unrequited love is love that is not openly reciprocated or understood as such, even though reciprocation is usually deeply desired. The beloved may or may not be aware of the admirer's deep affections."
Daisy is one of the main characters that shows this type of love. She knows that Gatsby is in love with her, and she pretends to be in love with him leaving him in unrequited love. Daisy shows her shallowness in making Gatsby believe she loves him and allowing physical consummation which does not give him the emotional security he needs.
In the beginning of the novel, Nick falls in love with Jordan, whereas she is not taking it as seriously. More towards the end of the book, he begins to fall out of love with her, while she's finally falling in love with him. They love eachother at the wrong times which causes their love to be unrequited.