In all of the 2000 years he lived in immortality, he never once felt peace or find a way to fulfill his desires to live without pain. He was only filled with hatred, revenge, and madness.

All of that changed when he met you, he took you in as he saw you somewhat of a help and use to him. Not knowing that he'll soon grow attached to you.

You were a breath of fresh air for him, a nostalgic feeling he hasn't felt in a millennia. He can't afford to let you go now, never.