Most Helpful Guy
If he's enjoying playing with a lot of girls there's nothing you can do until he changes his mind himself. It's a dumb idea.
Most Helpful Girl
It's nothing but if you want, play hard to get no matter until you see that he only focuses on you but really, be who you are because sometimes players tend to challenge themselves to the girl who has no interest in him or he gets to see a unique or different kind of characteristics that you possess that he also don't usually see this to any normal kind of girls that he usually play.