Why am I not upset over grandfather's death?

I learned a week ago that my grandfather had stage 4 throat cancer. I had saw him the week before and thought that It was just a cold, well thats what my family told me they did not want to to be upset When I first found out I was really upset but realized he lived a full life and was going to a better place so I was not upset for to long. Today I learned that he died and I feel no sadness whatsoever. I went about my day and did not even think about it. Is that normal because me and my grandfather were pretty close. Someone plz explain I really loved and still do love my grandfather