I'm just not into him, but he won't let go.
Most Helpful Guy
Stop communicating with him or, at least, limit the interactions between you two. As communicating with him only gives him false hope that somehow, some way, he has a chance to win you over. I mean, has feelings for you, therefor, he cannot be a platonic friend to you. And as long as he can reach out to you, he will not go away without a fight.
You simply have to have the courage to convey to him via your actions that you have been there, done that, moved on.
Most Helpful Girl
Tell him to leave u alone and talk it out and explain u never wanted him as simple as that (: