Why me?

Why do I fall for girls so easily? And, at the same time, why do I have such rigid criteria to like someone more than just as a normal friend? Is it the greed for better? Or is it just the feeling that a relationship is a huge thing and I'm just not ready for it? Oh, the last statement just made me laugh. Saying big filmy things like these are not the sort of things I do normally. Trying to understand my own feelings points me at one possibility - I want to get to know her and see if it is possible to have a relationship with each of the girls I fall for...makes me feel quite stupid (nothing new to me of course :P)