Why come the boyfriend we only got to see in one episode that song hey man with her never appeared in anymore future episodes of the show ???

https://www.youtube.com/watch?v=n3eJkf4erbI
https://www.youtube.com/watch?v=n3eJkf4erbI
https://www.youtube.com/watch?v=n3eJkf4erbI
https://www.youtube.com/watch?v=n3eJkf4erbI
https://www.youtube.com/watch?v=n3eJkf4erbI

I don't know. He was the funniest of Denise's boyfriends.