Stay away. I am not suggesting you never talk to him again but this guy is playing a game, or he really doesn't care about you. Either way, the only way to get his attention and know which is the case, is to be too busy for him. When he calls, tell him you have plans that day but you could do something another day. Take it from there. This is more than a game, this is about the difference between being that girl who is hung up on the guy who is using her as a back up plan, or that girl who knows what she wants and doesn't have time for games.