Harley Quinn’s story of love and loss is a tale as old as time. Girl meets homicidal maniac boy, falls in love with said boy, and then comes to the realization that he’s a whole piece of garbage who was actively holding her back from the true greatness that everyone around her could always see she was destined for.
Source: io9 – Harley Quinn’s Showrunner Has a Very Good Reason for Why Harley and Ivy Aren’t Together Yet