Most Helpful Guy
No matter if his feelings get hurt or not if he likes you and you don't in that way it will be good for him to know. It would be selfish to keep that from him just to have his attention. If he is the type to not like being friends with people he has feeling for that is infortunate for you but at least you be doing the right thing.
Most Helpful Girl
It's your call and it should be really simple. If he asks you out for a date either you have decided at that moment you would like to give it a try, or you know you do not want to go on a date with him, just be kind and tell him you think he is nice and all you just don't want to date him yet or ever.