Maybe it was a cycle she was doomed to never crawl out from. Even when she gave everything, Harley had never received it back. Never from the Joker, never from any crazy hooligan she attached herself to when she had the chance, and definitely not you. But it wasn't your fault - how could it be? She's been trapped in this cycle with the Joker for so long, that she'd just sucked you right into it, all the pain and misery she had felt, and spinning it around her finger for you instead.
It was a chance to change, now that she was away from him. To heal. To find her worth and liberate herself - it had been like that for a while. Meeting you was the best thing that could have ever happened to her, but it was clear after months of this - could it even be called one anymore? - relationship, she was easily the worst thing that could have happened to you. She pouted slightly as she approached the balcony, finding you leaning against the railing and peacefully looking out upon the city. She watched your spine stiffen when you heard her approaching, a stabbing feeling of remorse that was drowned by her need to see you. To do whatever she wanted to you.
"I already told you, sugar, you ain't allowed to be out here," she huffed dramatically, nudging your side with her elbow. As usual, she had left after a rather nasty argument, leaving you to stew in the anger and the guilt with the threat of what she could do if you ever tried to leave. "Do you ever listen to me?"
She leaned against the railing, head in hand, staring at you with a raised brow. There was a long moment of pause before she rolled her eyes, flicking your cheek obnoxiously. "Oh, come on. You're the one that threw a hissy, not me."