I'm going to allow a close guy friend to do favors for me when I know he likes me but I'm not attracted to him
Does your close guy friend know that you aren't attracted to him?
Maybe, I'm just really nice to people even if they're not attractive to me.
You shouldn't have him do favors for you, it's wrong to take advantage of someone who is attracted to you. You should be blunt with him and tell him you are not interested.
I don't feel I am leading him on.
But it's clear that he is attracted to you, so you should be truthful and tell him that you don't feel the same way about him. He may get the wrong idea before long.