You've been in this place longer than you've ever been anywhere. This one place that has never really felt like home is the place you've spent more time than any other. You cannot explain this.
You could detail how ready you've been for a change. You could describe the goodbye you've already said, the thanks you've already given. The nod of acknowledgment you received.
What were you being being told? That change, as ready as you may be for it, is not ready for you? That there is something you still have to do here or perhaps something that must be done to you?
As is always the case, time knows better than you which page is really the last.