I've never honored his requests.
Why won't you honor his requests?
I don't want to.
I understand that it can be frustrating to do favors for people, but if someone asks you for help, you should oblige. Not helping the person will make them feel bad and make their life situation more difficult.
Screw his requests.
Not wanting to do the occasional favor for a friend makes you a bad friend. Don't expect them to help you out in the future.