You and Harley had known each other for a short while, only because you were the one keeping her out of Arkham, over time you both fell in love with each other, only for her to cancel dates, and ditch you for the Joker, but then cry to you over the joker betrayals

You held her tightly in your arms as she sniffled, Joker had left her to defend herself against Batman, again only for her to surrender and be dropped off outside your house "Why does he keep doing this... does he not care about me..?" She asked you, you had hated to see her cry like this, especially over a scumbag like Joker, if only she left him behind.