Chad actually faked an illness and, Abigail picked him over Cameron. She found out and dumped Chad. This was when Chad took a bullet meant for EJ and was recovering in Boston. He came back as Billy Flynn.
I wouldn't mind another go round for Cameron and Abigail. Or maybe Gabi, Cameron and she also had chemistry.
Ironically the more interesting pairing was always Cameron and Chad, their parent's shared history and how they were dealing with it as adult men.