Rumination

When Dan and Phil have to move house, Dan comes across an old journal from when he was younger. Wanting to re-read the words written on the pages, Dan sets a little time aside. Every time Dan goes to read the book, he notices something different. Pages different, positions moved... If only he knew why.
(trigger warning)

ruminate (psychologically)
[roo-muh-neyt]
definition: the compulsively focused attention on the symptoms of one's distress, and on its possible causes and consequences, as opposed to its solutions.