nyctophilia;  (n.) love of the night; finding relaxation or comfort in the darkness. 

One night was all it took for him to finally feel alive. He developed feelings that he never thought he had for a girl he had just met. Only a few words were exchanged between them, but it was enough for him to comply to her every word. He loved how her touch left a burning sensation on his skin, how her eyes just bore into his, how her scent lingered in his mind for days.

Because of her, it made him love the night, because it gave him hope that he'll see her again. The only thing thing that he remembers is her smile that seems to taunt him.

It's not an obsession, but an uncontrollable affection he had for her.

But there was also this small hatred he had towards her. She stole everything he valued; his love, his heart and his ity. 

She was the thief and he was simply the victim.

[WARNING]: Mild ahead (in my opinion). You've been warned...