Here’s a pretty good representation of the stages of grief, though the shape seems off to me somehow.
On my journey, it hasn’t been a steady slope, up or down. It’s been one step forward, another step forward, three steps back, two steps forward, etc. And a stage, once past, isn’t gone.
For me, at least, it’s still there; it’s like a brick I’ve laid down and since stepped up to the next. They’re cumulative, and, while I can’t see the bricks underneath where I am now, they’re still there and still liable to rise to the surface on a bad day.
I go digging for them when the need hits to regress to a previous step which is emotionally necessary right now.
See also: Grieving Can Be Complex