That's not true. Maybe that's how it is where you're from, but not in my world. He's a vampire. He has a soul - but -- it's because of a curse. And if he has a moment of true happiness, it's gone, and he's not a man anymore. He becomes this really scary demon. Which is what vampires are, demons setting up shop in a human body, but it's his body, and his soul is in it, and it needs a way to stay there. Not just by way of the curse, but in a permanent non-breaking sense.