What do you think it mean when a guy flirts with you and then pushing you away?
Playing hard to get. Or... he's a player.
he changed his mind
It means he doesn't know what he wants. Stay away from those guys as they tend to be players. They just like the attention.
playing hrd to get
Maybe he wasn't flirting and you just took it the wrong way
It means he is not mature enough for you.
Maybe you are to mature for him.