Well you see, I've never really bothered finding a proper definition for this. Somehow the group of people I associate with converge naturally to those I find chemistry with, be it emotional or physical. Perhaps it's rare to find a partner who can satisfy these two main aspects of a relationship, I don't know. I just hang out with whomever I deem interesting enough to make my heart beat faster when I know I'm going to see them (that includes friends).
But my solution for not being able to click? Find someone else to click with, since there are many fish in the sea. Even when it comes to friends, I think you can find friends everywhere. People see this nonchalance as being apathetic and unpassionate, but this is life isn't it? Why hang on to something that isn't yours to start with? Whether we eventually meet life-long friends or a partner to spend our lives with is our own responsibility. Naturally, if you're unwilling to compromise and give in from time to time, then you cannot complain if people don't like you.
Chill and everything will be alright. Let nature take its course. Yes I know, it sounds cliche but it makes perfect sense.
And me? Nah. Don't trust me la. 'Cos I'm weird and inconsistent and bore people to death and not so smart. Don't hang out with me, really.