What does it mean a man calls you sweetie?

It either means that he is trying to holla at you or he is trying to be sweet and impress you....:)

Answer

It is an old fashioned way of paying a compliment to you. It does not mean that he is trying to have an affair with you, but that you are an attractively nice person and he wishes to let you know in the kindest way that he has noticed this. Accept the compliment gracefully but do not encourage him. The term is similar to you saying "Hello handsome".