sex time

boyfriend wants sex every day and we've had sex almost every day for a year. ive never been with someone who wanted sex this much. ill tell him im not in the mood but he doesnt seem to want to take it as is. how do i tell him im not interested without making a big deal out of it..weve dicussed it but nothing changes. and i feel bad for saying no and end up doing it anyways. i enjoy it every time but i dont have that kind of sex drive..and he wants to use his hand on me like every day.