Hmm, well, I can't speak for girls, but I know if i meet someone and they really like me too soon, then I kind of don't trust them. And I think I did that. We'd only been on a couple of dates, and she lived like 6hrs away by train so I had to make quite a journey to see her, so it all got built up.
Surely you've met a cool guy, and then he's liked you too much too soon and it's turned you off?
Well, it still sucks even if I understand it.