Often you will know the moment you meet a guy that there is something special about him. It's that 'eyes meeting across the room' feeling. We are not talking about sexual attraction here, but something deeper.
It's the same feeling that you might get when you first meet someone who is destined to become a great friend. Your intuition tells you that there is some link between you and him - like you already know them. There is no desperate desire, just the feeling that it is right that you should get to know him.