This is a reference to the Nietzschean idea of the eternal return, which is originally used as a part of a vital and life-affirming philosophy, but when considering that not all of us have agency at all times, it hints at something darker: if you're going to relive every part of your life, you need to make decisions you're comfortable making again – but you're also doomed to re-experience the worst things that happened to you innumerable times.