Olivia Martin and Carson Tanner

The relationship between Olivia Martin and Carson Tanner is the longest running on and off again relationship in then series, second to the relationship between Kat and Damian. The relationship began as an affair in early 1990 and ended in 1994, when Olivia was in high school and Carson was dating her older half-sister, Myra. Due to Carson marrying Myra, Olivia finally ended the relationship, only to find out she was carrying his child, who would become the "Destined" one.

Reunited
Around 2011, when Kat was outmatched by Super Demons, Carson appeared out of nowhere and killed them.

Quotes

 * You could have told me about Kat from beginning. From the day you told me you were pregnant. But instead, you had to wait fifteen years to tell me!