Please Help me!!!!!!!?

I have a guy friend... we are good friends.... we share each and everything.....there is no secret with us....but yesterday he asked something with me and i am confused why he asked like tat. what he said is 'I feel that i am using you...Why do i feel like this?' this is what he asked wit me...we are good friends and we are not depending on each others...but the thing is whatever we do we share it and then do that work... do he feel like tat because we each and everything? i am not sure? Can you give me your advice please????