Everything is forgotten sooner or later. Life moves on. Even terrible things grow old over time. The psychological term is habituation. People who leave near airports no longer hear the jets. People with mansions stop feeling wealthy.
And people who lose someone eventually stop grieving.
Our minds are designed to habituate. The past is forgotten, put in its proper place. Intense stimuli become second nature. And terrible things become commonplace.
We can`t hold on even if we want to.
And yet there are things that stick. Not things you choose, but things that choose you.