This relationship is between Quinn and Finn also called Fuinn or Fabson. Their relationship started in the first episode of Glee, Pilot.
The relationship between them didn't last long and in the first competition episode, Sectionals, Quinn was caught cheating on Finn and lied to him that he was the father but Noah Puckerman, Finn's best friend, was in actual fact the father of Quinn's baby.
They got back together either in or before the episode Sexy and broke up again in Funeral, because Finn still had feelings for Rachel and didn't think he could figure things out with Quinn.