No tears... Not even a lump in my throat.

I can understand this. I think you are normal. I think most grief is felt from the guilt of things unsaid and to be honest that guilt can be felt instantly or many years down the road. I know that a lot of pain can be felt down the road when you go to pick up the phone and call someone who has passed many years ago. There is so much life to deal with that death sometimes has to take a backseat.