Black Knight by Rina Kent

Kimberly: He was once my best friend, now he’s my worst enemy. Xander Knight is heartbreakingly beautiful. Ridiculously popular. Brutally cruel. He’s a knight but won’t do any saving.

Xander: We started as a dream, now we’re a nightmare. Kimberly Reed is pathetically fake. Terribly innocent, Secretly black. She can hide but never from me.