Fading Façade

Mr. Gatsby, up to this point, seems like a cool, collected figure of power, manipulating and persuading everyone he meets (or at least Nick) to do whatever he wants. however, upon Daisy's arrival to the Tea Party, he very uncharacteristically becomes shy, clumsy, and incredibly awkward. He mumbles around Daisy until he is told that Daisy is just as embarrassed as he is. Gatsby then puts on his mask of cool, "old-sport" personality, and the the visit turns for the better.
So which is the real Gatsby? do we really know who he is? what if Gatsby reverts to awkwardness again? will Daisy leave him?