How Do I Break Up With Someone I'm Not Even Dating?!

It seems like he is in denial, and he thinks the nicer he is to you that maybe you will stay with him. It is very hard to hurt a good friend's feelings, but in this case I think it needs to be done. I am glad you haven't been trying to lead him on, but even after talking to him, it must not have been clear that you just want to be friends. Since you know you have already broken up with him, I would consider writing him a letter, to explain how you feel about him and how important his friendship is to you. Talking to him in person would probably be very uncomfortable, and he may not let you say everything that needs to be said. I wish you the best of luck, I hope you find someone that IS perfect for you :)

Just tell him exactly but nicely how you really feel about him and how you would feel more comfortable and would rather be friends w/ him  instead of dating. And maybe tell him why
but don't just throw it at him and then never talk to him.
Hope this helps

Tell him plain and clear in case you have forgotten I just want to be friends and nothing more sorry I'm not trying to hurt your feeling but this is how it is we talked about this subject a while back ween him off just tell him and then if he calls or something just ignore his calls or if you see him in public and he ask about you not calling say you are busy and don't have time to talk.