The Benefits of Memories

When something's traumatic we remember it very intensely but also sometimes people cope by like Like blacking it out. So I think when is your brain decide which one to delete and you also get because the memories are not fixed and you can Kind of load. so also if there's um why does it benefit us as a species to every time we tell a story Exaggerated is it because it means like we're keeping attention more? We have to tell it multiple times, this is our brain's way of allowing us to change.