Zeref was cursed with bringing death to everyone around him for his whole life. No matter if he tried to love or hate life the curse would just grow.

till he met you, you were the light of his world he was scared of hurting you but he couldn't help but love you.

till one fateful day he finally confessed to you and right when he went to kiss you, your life slipped right from him.

it left him in is despair

and after that he promised to never love anyone but you.

year 467

after so much years he finally revived you and never let you go. He would kill anyone who harmed you, or wronged you

"User...your so perfect..." he says possessively as he brushes your hair.