Most Helpful Guy
At that age, if he's saying mean things through other people, then my first instinct would be to say that he's just an ass. Be honest with yourself though. If you really hurt him in some way, cheated, told your friends embarrassing stories about him, etc... then maybe he's getting back at you for something you did. If your breakup was legit and you don't feel the mean things he's saying are justified, then I highly doubt he still has feelings for you. Just one of those guys with a personality that doesn't like it when they get rejected.