You can't. You think a guy is gonna change for a teenage girl? No he won't. He's gonna change if HE wants to change. I was a player, been with many girls and did wrong things. No girl changed me. I changed by myself because I realized what I was doing was wrong. And I changed when I was single.
You don't. You just pick up your pride (and panties, depends on how foolish you are), and walk away. No woman has Wonder Woman pussy, you CANNOT AND WILL NOT CHANGE A MAN. YOU WILL NOT CHANGE A MAN. HE has to want to change, and he'd do it for himself. BUT NEVER FOR A WOMAN. You either accept him as is, or MOVE ON.
He will never change; he's got you where he wants you, giving you hope that you can change him and then voilà you are hooked and then he'll use you and make you cry in the end. The worst case scenario is that you get pregnant and he leaves you right on the spot. Is that the future you want?
Move on. You'll be better off you can't change anyone hell it's even hard to change yourself sometimes but pray for the player and focus on your life. Players thrive off attention from women the same way hoes live for a man's attention. Show him your not one of his groupies and carry yourself like his best and only option that he would be dumb to play games with! I'm a player by the way
The funny thing about women calling men 'players' is that it's usually the woman who played herself by using goofy logic like "I'll agree and then try to change his mind, and if he doesn't then he's an asshole".
I would consider my self an older player. My thinking: no girl on this planet owns my heart, you play by my rules. That said , my rules are honesty and i let them all know I'm not looking for anything serious.
Whenever you see a player, AVOID them, or break up with immediately. You'll regret being with him later on. Find a a nice guy that cares for you, even when you break up you'll never regret it and you might actually miss him.
You give them better sex than any other girl ever could so that they become spoiled from it and can never enjoy it from any other girl ever again because it would never be as good so they desire you and only you.
You should go on like this until you're sure he loves you. Be distant most of the time; but not that distant so you're completely out of his life; just enough to make him miss you and not get bored of you.
You can accept to be his girlfriend when you know he has true feelings for you. You can test him from time to time: for example, making him jealous and seeing if it works.