Nick says,"there are only pursued, the pursuing, the busy and the tired."what does nick mean? how does each character in the novel fit into this schema?

Nick means that people can fit into only one of these four categories, which show that no one is truly happy in their lives.

Gatsby and Tom are the pursuing, Daisy is the pursued, Jordan is the busy (too busy to care about anyone else or being a good person), and Nick is tired. He's tired of having to deal with everyone else's drama and problems.