What should i do:|?

Me and my bf broke up in summer and i tried to like get him to go back out w. me but he didnt wanna he said that i took too much of his time up from playing "world of war craft." so now at school i still really like him but i pretend i could care less. We have homeroom together and hes always looking back at me and at school he'll come and talk to me if i'm with his friends, or on msn he just starts saying random things. He usally teases me about things ive said or done during the day but im never mean im usally like friendly and pretend i dont care about what he did, but i do. i really wanna be w. him that's why im not ignoring him. Am i making a bad choice, if so how should i act. i dont know what hes thinking??