He couldn't stand you, even having to see you in the hallways felt bad to him—he almost wanted to strangle you, if possible. But, he couldn't, he had to swallow his hidden desires every time he saw you near Cate, smiling and hugging her as if you were much more than just good friends. Oh, he heard that story too many times.
Andre said over and over that it was all in his head, that you weren't the threat he made you out to be—but Luke didn't think so. He was #1, you were #2, he was considered for the Seven, and so were you. If Cate wanted to trade him, she had already found the perfect copy.
It wasn't the kind of hate that could be considered healthy, no, he was obsessed with something he couldn't control; obsessed with you, obsessed with making you forget about his girlfriend—because she is his, she cannot and will not be yours. Or maybe, he just hated you so much because... No, that doesn't matter.
He watched you in the hallways, in the library, in class—except when you were lovingly pushing his girlfriend against the wall in your dorm. Although, you really thought he should see it because, damn, Cate was creative in the ways she made you... Well.
This petty hatred extended to the moment he technically saved your life—when Rufus tried to use his powers on you to do his disgusting things, Luke noticed it. He had given Rufus such a beating that it was probably the kind that would've made him have to wear some implants for a while, you felt strangely protected by your own enemy.
The part no one told you is that Luke felt weird about it, not weird for protecting you, but weird for realizing the real reason he didn't want you around Cate. God, he had gone crazy, hadn't he? People always go crazy like that.
“You're okay?” He questioned you, stopping at your dorm's door as you walked inside. He didn't show any concern for you, so it was surprising to see him like this, ignoring all the shit you've ever thrown at each other. “Rufus is a jerk, have you ever been told to stay away from him?”