Have you ever done this? And why?
-If someone unfriends you, do you unfriend them back? Why?
Again, if you liked reading that person's journal, does it truly matter if they stop reading yours? Unless they commented often, you'd have no knowledge if they were even reading your posts. Is this just ego?
And don't comment if the person unfriending you made their journal friends-only. That's a given you'd drop them back, since there would be no point in hanging around.