This is a little more fan fiction.
The Remorse Erik feels is showing Christine his face and destroying all they had.
The start of the video is the present, after this we see how Erik & Christine met   more...and how their relationship grew, Erik saving her and loving her. Christine convinces Erik she loves him too but in truth she wants both worlds and longs to be with "normal" people and she seeks this in lively clubs. Erik becomes suspicious and asks her where she goes but she lies to him, he doesn't believe her and follows her one night. He sees that she is going to a club full of light, life and laughter something he could never offer her.
Christine begins to doubt her love for Erik and keeps going to the club, Erik follows her again and sees her in another mans arms which sends him into dispear. To try and keep her he brings Christine down to his domain and, when she begs him to, he premits her to look upon his face (this is now the present).
Christine faints at the sight of him and Erik become enraged, when Christine awakes she tries to flee but Erik follows her, determined to keep her with him forever, but Christine manages to escape and Erik is forced back down into the tunnels.
Christine regrets what she has done, seeing that she does love Erik, but in her heart she already knows that Erik has died from a broken heart T_T  less

Movie: Desert Saints Music: Lovex - Take A Shot