The Seed Within: The First Born Series

I searched for two hundred years for the one that could complete me, the firstborn of my kind. Then in seven short months, I found her, fell madly in love with her, showed her the world she was meant to rule, and somehow managed to bring her right to her own death. Now due to a curse her own father placed on her death, it meant I have yet another mindless vampire to hunt and put down. How do I save her from herself? Hell, how do I live if I have to bring my love a true death? Or can I save her?