First and foremost this guy is a "player" and he knows he can have his way with whatever girl he wants but in the end the girl will get hurt a lot. Time in a teens life changes constantly and like every minute so don't expect your friend to be with him long here as he will get bored of her and then it's your turn but he knows exactly what to say to keep you with him so be very careful and make sure this is really what you truly want to get involved with as you will get hurt.
You can do better than this guy and even though he may not be as attractive or desirable as this Player, he will be a much better catch in the long run and you'll be much happier. Good luck