I think he was afraid that he would hurt her in the end, that he would either do it as a werewolf, or as a person. But also that maybe the dark lord, or greyback would use her against him in this upcoming war, could also have been in the bakc of his mind. That she would hate him for being a werewolf, and that he might at some point hurt her while being a werewolf. But i think he was more afraid for himself, that he was too scared to let her love him like she did. |