Recently i met someone who obviously doesn't understand "unwritten social rules". When i met him, I though he was a cool person who could become my friend. So we went on a drink. We had discussion and everything was OK. The problems occured on a second time. When i came to the bar, there was another his friend sitting ther. He didn't mentioned or asked me if he can invite anyone else, which is something one should do, considering the fact i didn't know his friend. It seemed that neither his friend was awared that i would come. We met once more, he called me and invited me to go out with him. So on that friday we went out. But when we came to the club, he suddenly called 3 "friends ". They were really surprised to see me, as he didn't told anyone I will come, just as i wasn't aware that he also called his other friends. As I was really embarassed, i went home early. The other time, when we were on a drink, he suddenly went out of a bar, to say hello to his friend who he saw outside. I was really shocked. He also asked me if i could pay, because he doesn't have much money. He invinted me on a drink, and then he asks me if i can pay after he ordered. That just doesn't seem right. Now i'm thinking whenether I should ever met him again. We have a lot in common, like music and movies, but his behaviour just seems unacceptable. Does this behaviour fit any personality disorder or is that "friend" of mine just unawared of "social rules"? Any kind of an answer will be appriciated.