There were many things that very few people actually knew about Ella. Everyone knew her violent streak, she was infamous for it. They also knew that predictability wasn't really in her vocabulary when it came to the vast majority of her actions and thoughts. Only Ella's younger brother knew of her life in Bulgaria, or what a little boy who was born thirteen years after his older sister could know of her life. He knew her parents, as he shared the same, but definitely did not know the extent to which they had influenced her in the first seventeen years of her life.
Only Terrence knew exactly how she felt toward him. To anyone else, she was a shallow pool of emotion, no depth, no true feelings. She liked to keep it that way, and still had a small amount of hesitancy to Terrence having seen that in her head. He knew of a few key interactions she'd had with her parents over the years, again because she'd let him into her head in order to divulge to him the secret of the Complacens. What absolutely no one knew, though, was what her life, prior to her journey to Hogwarts for the Triwizard Tournament, had really been like and how she'd been effected by it more so than almost anything else in her life. The only thing, or person, with more influence over her--an influence which she did not mind in many ways--was Terrence. He had been the one who'd unwittingly warped her discontent with life at home into the independent force she was today. He did not know this, and, as much as she couldn't hide her thoughts from him the same way he mostly couldn't hide his own from her, she planned on keeping it that way.
The other thing no one knew about her was the precise--or not so precise, as it were--reason why her most notable trait in outward appearances was her territorial jealousy. In many cases, her jealousy helped to fuel the passion between Terrence and herself. Most of the time, it wasn't something that forced a wedge between them because neither of them truly gave the other any reason to believe that jealousy on either of their parts would ever accumulate to more than just a fleeting predatory state of mind that would soon be resolved by a night that left no doubt in either of their minds to whom they both belonged.
Ella's own tendency toward jealousy, she knew, could be traced back to an upbringing seventeen years in the making; an upbringing in which Terrence had not existed, where she'd never actually been good enough, or perfect for anyone in her life. It had never really been any fault of her own, she'd just been born a female and, with that, had no real purpose other than to help some other Pureblood family carry on the bloodline which resulted in the few mockeries of relationships in which she'd been involved before meeting Terrence. In school, she'd worked hard, but had never been the best. Her strengths had always laid in her body and instinct as her mastering of Legilimency and Occlumency had never been of particular interest to her own professors.