Fall in love with a vampire? Really?
So, you meet this lovely girl, you get to know her a bit, then it turns out that she goes around in the night killing people. And she hangs out with a gang that drive from town to town killing people. And they've been doing it every night for years - some over 100 years. So that's 365 killings a year each, they must have racked up about 100,000 killings between them.
But it's ok, because she's pretty. Just give her a blood transfusion and she can move into the family home. Lol!