My close friend has been asking me out to do things with him. More often than not we are always hanging out with his friends. The past two parties he has invited me to, he has just left me on my own after introducing me to a couple people. I have noticed that frequently while I am holding court amongst my new found friends, he is watching me. But when I look at him, I will give him a quick smile and he never smiles back, just stares at me. And it's not in a creepy way or anything, I just can't read whats up.