In simple terms, she was his Jenny.
Jenny was the happiness to his smile, the displeasure to his frown, the sadness to his tears, the thought to his mind, and most of all, the love to his heart.
So, yes, in simple terms, she was his Jenny. But what it really meant was that she was his everything.
She was his everything and it broke him. He loved her so much and he didn't love often, and none were like Jenny. Jenny consumed his every thought, his every action, his every word. She might as well have been the spell that made him a vampire. He lived for her.
But, sadly, she was just a human. A beautifully, happy human. One that he loved with every fiber of his being. That was the noble Original's undoing: the love of Jenny.