It's An Innate TendencyI do believe that human beings tend to gravitate to those who we can't have. Especially when we feel connected to a person and want them in our lives for the long haul. It's an interesting thing, because those who fancy us and give us attention, we tend not to want.
I know that in the past when I've liked someone, it's usually been because I've been fascinated with the idea of them, once they got too close, i'd be quick to push away. I can honestly say I've only allowed to feel love once thus far. And I can't have them, and yet in some twisted way it makes me want them more. Because they fit well with me, personality wise and because I've grown to be so fond of this person.
I'd be quick to say, that I hate how love ends up being a game most of the time. But then again, i'll be one of the first to admit, that in love, you need a flame, a spark to get things started. And then once you grow so close with a person, you don't see love as a back and forth thing, you want that person, fully, and when it's not working in your favor, it's simply devastating.