This just makes me hurt for both of them. He wants to badly to correct the mistake he made by killing her, but he just managed to fuck everything up more. I don't think she'll be forgiving him anytime soon :(

This part especially got me:

Sylar faded away as he realized that she had liked him, really liked him, as Gabriel. She had been trying to protect him from his fate all along.

His stomach lurched and the tears in his eyes turned hot. It was a feeling he hadn't experienced in so long, not since he'd first met her when she came into his repair shop that day. Guilt. Remorse. Hopelessness. The wretchedness of having broken something beyond the point of repair.