We are a part of overlapping stories, stories which we are creating in our lives with others around us. So many experiences overlap with a different view towards all those passing moments, but all the characters share those same experiences. These overlapping experiences fade with distance and when the stories stop overlapping, the experiences are different.
As the time passes it’s difficult to keep track of all the experiences, as the stories are now different. It becomes difficult to understand the current passage, as you have missed a few pages. The connection is still there with the memories of that overlapping phase, but since then things have changed, you can now see the change, but the reason is missing.