You may have heard the story of Fred Stobaugh, a 96 year old guy that had recently lost his wife of 73 years, Lorraine. There was a song writing contest and Fred was inspired to enter. He wrote basically a poem to Lorraine and submitted it, though he didn't sing or put the poem to music. The people running the contest were touched and turned his poem into a song. The story is in the video below and you can hear the song at about the 5:50 mark.
What I really like about it is for me it expresses what I expect I would honestly feel if I were in his shoes. So for me it's very relatable. Fred seems to be expressing the belief that he cannot experience her again. He says "Life only goes around once, but never again." "I wish we could do all the good times over again." "But the memories always linger on." The sadness and grief is especially deep because he views her as truly gone, except in memories. For me that's how I would feel.
But if I had gone through that experience as a religious person, as in my earlier days, I don't think I would have felt that way. Death is a temporary separation that ends in heaven where the sadness is remedied. This is a comforting belief and I have no interest in preventing others from convincing themselves of this. But it's not really possible for me to grieve in that way any more. This is more how I would have to grieve. It's sadness without (what I consider to be) illusions. I wonder if that is how Fred is grieving.