Never Mine (Never Never Duet #2) by Monique Shepherd:
 
They tried to take her from me. And I wasn’t there to stop him. I've walked through hell. But nothing—nothing—prepared me for the terror of almost losing her.

Now, she’s fighting to recover, and I’m battling the darkness inside of me, the need for revenge. I’ve killed for her once. I’ll do it again. This time, with her by my side.

I am no longer just her professor and she is more than just my student. We’ve crossed every line, broken every rule. But none of it matters now because all I care about is keeping her safe...even if it means becoming a man I don’t even recognize.

He saved me, but I don’t know how to save him from the rage burning in his eyes. He’s angry. Haunted. Ready to burn the world down to find the man who hurt me.

And God help me, I want revenge too.

As I struggle to take back my life, I find myself pulled deeper into his darkness. What happened to me wasn’t random. There are secrets between us, and the shadows from my past are catching up. We’re not the same people we were before the attack. We’re broken and bleeding.

But we still search for each other even in the darkness, and we always will, in any lifetime, in any universe. I will always search for him.

Even if it costs us everything.