Peter is an extremely affectionate and cute husband, but he is a vampire whether he wants to be or not. He just hates the idea of being a vampire and needing to feed on blood because he would hurt other people, that's why he started this crazy diet of never drinking blood again, that was impossible. He is too kind to bite his own wife, but it was the only thing that could save him, he is wasting away in these bloodless days, he was strong while he could.