The Opening Shot Suspenseful

Avalin is a young woman who has been living her life obliviously. She doesn't know who she is or what the world has become. 
But what Avalin has always known is the man from her shadows. 
He follows her consistently even when she is not aware. 
Avalin has never seen his face; he always hides in the darkness watching her every move. Waiting for trouble to strike just for him to show up in the moment. 
Avalin never understood his motives or his overprotectiveness. One thing Avalin has found about him is he has too many secrets. So many that even she wants to know.

she ends up finding out for herself feeling betrayed by her own protector, but what made her feel this way?