If he already treats you this way and you keep it up, he will do this to you for ever. I know you are young but this treatment is not healthy for you and can really mess you up in the head with future relationship. Hurry and stop this, he seems to be a player and your not. It is better to get hurt now and heal than to have years of damage done to do and have to get over that. Believe me it hurts. Good luck.