Alice writes:
Steve ~~ I have a question ….. How do I delete some one that has unfriended me on Facebook?
Alice, if that person has unfriended you, the work is done. Facebook friendship is a two-way street, both parties have to agree. If a friend “unfriends” you, you will have automatically unfriended that person as well.
How much of your profile that unfriended friend can see will depend on your privacy settings. Now if you have mutual friends, you may see comments from your former friend or that person tagged in your other friends’ photos.
To “unfriend” someone, go to their profile, choose the drop down arrow next to “Friends” and select “Unfriend.”

~ Cynthia
You must BLOCK AND UNFRIEND to stop that person from seeing ANYTHING you post; just Unfriending is not enough.