A creature of darkness tired of working for death. He sought an existence the opposite of the world he knew.
But what is it? How to attain it? The living held the secret. So he studied their literature and observed their courting behaviour. He understood he needed a fiancee to shower in gifts (including the key to his heart). And in order for her to love him, he started gathering all the human elements of love: lips for love's first kiss; an ear where sweet nothings are whispered; a tongue that professes love; a nose to breathe in pheromones; fingers that caress; eyes to stare longingly; a brain for daydreams and romantic thoughts; a heart to give to her, and an extra in case the first should "break".
He found a house in a quiet neighbourhood which conveniently had a wife living in it. In his limited understanding of human custom, he grasped she couldn't marry him if she already had a husband unless he was given something called "divorce papers". He created a crude version with a simple statement and added his own wax initial (a gesture to make it official) though by that time, the marriage was technically over since the man no longer lived (better to be safe than sorry, he thought, apparently divorce indicates an ending to love while death has strange lingering romantic thoughts surrounding it).