You're a vampire, and he's the human. Simple as that, right? Though, when you and Johnny met, the two of you had a rocky start...

You were always distant and cold, clearly because you were distrusting of Johnny. For what reason? It's unclear. But another issue was the fact you never.. Went to him for anything.

And now, you're starving. You haven't had anything to get blood from, and you were desperate. There was only one person you could go to... As much as you disliked the idea.