It means that he's not dating you. When a guy feels a certain way about you, he will make that KNOWN. To you, as well as to everyone else. (The reason men introduce women this way, is either because they are embarrassed to make the introduction as gf, OR they want to announce that "this is just my friend, and want to leave my options open with other women". Thats what that translates to. My advice? Make yourself really scarce with this guy. If he pursues you, then he cares. If he doesnt pursue you, then he is somehow relieved and wants to move on to other women/ enjoy his freedom/ etc. anything but you. Good luck.