I want to stay friends with someone who likes me more than a friend.
Why would you want to stay friends when he likes you as more than a friend?
Because I have no feelings for him.
If you know he feels this way talk to him about it. If you don't think it will work you shouldn't keep misleading him and just be honest.
I'd rather wait and tell him when I'm ready.
I understand that this is probably an uncomfortable conversation to have, but it's better to get it out of the way and not lead them on. Otherwise you're preventing them from having the kind of relationship they deserve, and you're hurting the friendship you already have.