Memory is fluid. It evolves as we do, changes along with us. It is, by its nature, both truth and illusion.
I think one reason I started keeping a personal journal so many years ago is that I realized this to a certain degree. I knew that what we remember about any given event in our lives is selective, filtered by the current moment. If we are feeling good, optimistic, we may remember an event in a positive light, whereas if we are feeling down, anxious or depressed, we might remember that exact same event, but focus on elements that were not positive.