Facing the end

I have been with this cancer site for quite a while It has helped reading about people with lung cancer. It is over two years since my husband has been diagnoised with stage 3 lung cancer He tood the chemo & radiation  It did seems to help & they said the tumor had gotten smaller. My husband & I were happy with this It came back after a year & they said he could not take any more chemo or radiation At this point he is getting very weak The doctor said we should tell him that there is nothing else they can do. I refuse too do this because no one  knows my husband like I do after 35 years of marriage. He has asked where do I go from here I think if he knows the truth he will just give up I think in the back of his mind he really knows because he feels so bad & the time will come when he will be sure but why rush it I am not sure if I am making the right decision  Has anyone had to face this? Joan