He is the son of a very rich man, and more in love with D.J. than she is with him. He and D.J. have a strained friendship after they break up, which becomes even more strained because Kimmy Gibbler goes on a date with him, making D.J. jealous.
They get back together a while after they break up, after D.J. and Viper break up. Nelson and D.J. only go out once more, because Viper comes between them, causing them to demand that D.J. pick one of them, causing her to pick neither of them. After that, they decide to just be friends.