Any advice??

My bf grandfather passed away when he was in 4th grade (we are in college now). He brings the topic up about every two weeks and i am always listening and supportive. Well my grandfather has been sick now and i have been upset and telling him how its just so hard to see him like this and my bf goes "at least you can talk to him". I don't think he has gotten over hos grandfathers passing and idk what to say or how to help?? What do i do?? We have talked about it so much and i often always say the same thing i don't know what else to say