I would suggest that you ignore this boy since he does not seem to have the same feelings for you. When you do not give him too much attention, his ego might go down and he might really open up and tell you his true feelings. Make sure that you always look great so that it would be hard for him to act like it's no big deal.
he may not like you back :O. since he acts like that it may be best to not bother with him anymore. since he acts like that he doesnt have the same feelings for you as you do him. try to find someone else you like that has a good personality:)