Listen, if he is happy without you, it means he doesn't deserve you. If he didn't appreciate you for you, then forget him. Move on. There is someone out there who probably loves you more than anything, someone who feels that you are happier without them, someone in your situation too. Don't let anyone break your spirit, change your opinions, don't let anyone change you. Because if they don't appreciate who you are, then they don't deserve you.