Sorry, but all my mates tell me that I am always too slow to tell any girl I fancy them.... whether attached or not... If some guy has said to you "you have the most beautifull smile" take it as a compliment. Unless anything further is said, it is just a compliment. I have often wished I've had the guts to say such things, especially tonight in the pub!!!!! so yeah, you obviously have something that someone yearns for in life... be happy