Hi Theresa,
I don't think the conversation while snuggling and smiles and kisses are small. I think they are wonderful and you should cherish them. Yes, this disease will change your life and quickly.
I know somebody mentioned this, but has he thought about taking something for the anxiety/depression? The first time I heard my name and cancer in the same sentence I was in shock. I had myself dying before I could get married or have kids. I finally got over that but it wasn't easy. Everyone deals with this in their own way and time. Try to be patient and supportive, just like you have been. There is only so much you can do. In the meantime, let us help you and provide you with support. How old is your boyfriend? Does he live alone?