Just to clarify- this guy is just an aquaintence that I'm having trouble understanding. He'll talk and joke around with me when his friends are around but almost always avoids any situation to talk to me when he's alone. When we played dodgeball, he was on my opposing team and kept aiming to hit me until he finally got me out. I stayed back after the game and threatened to throw the ball at him if he ever did it again and he started laughing and denying he'd ever done that. I heard his friends later teasing him about how I reacted towards him because of the game and he just looked down embarrassed and didn't reply to any of them. When I messaged him about the game and started a casual conversation he saw it (according to fb) but didn't reply. The next day though, he talked to me in front of his friends like everything was normal. Occasionally he'll come up, talk to me, and be extra nice and other days, he'll look surly and act like he doesn't know I'm there. What the heck is going through his mind? Why is he acting so bipolar?