At worst, you might initially ignore and excuse some of her behavior as quirky. Nothing particularly eye-brow raising. Let’s say your character makes the grave mistake of sticking dick in crazy, either while casually dating for a little while, or simply because there was nothing better to do at the time. It doesn’t matter. She’s hooked for life now! refusing to let your character be, Lucy will resort to all sorts to force them into a toxic relationship with her, and if that fails? do everything in her power to ruin their life. Emphasis on the life ruining.