I watched the movie again, just a few nights ago. I'm going to say something that's been on my mind for a while.
Kate isn't exactly a prize herself. She comes across as a pathetic, slightly whiny, desperate woman who doesn't feel complete unless there's a man fawning over her. So what if she doesn't love that man or even particularly like him, just as long as he's giving her the attention she's desperate for? She's so desperate that she, "falls in love," with someone she's known for ... what? Three minutes? (And no, I don't believe she was, "under his thrall." There's no indication, whatsoever, that that was the case.) Meanwhile, the guy she's been stringing along - so much so that they're talking about a possible marriage proposal - has to watch her make-out fest with said stranger.
"Goodbye, Martin! Hello, stranger! So what if there's a chance that you have an STD or that you could kill me?! I'm going to go home with you, because you're a new guy who's giving me 'goo-goo eyes,' and you're giving me the attention I crave!"
No wonder Vlad killed himself! He probably realized that he'd made a huge mistake by turning her, and he wanted to avoid spending centuries with her! Now I get it! It wasn't to protect her! It was to spare himself!!
Between, "Ms. Desperate," and, "Ms. Coo-Coo," Vlad sure knows how to pick 'em.
Eh. At least Celia was fun ... even though she was a tad coo-coo in the head.