From time to time, you might see that the variety of your friends has decreased. When that occurs, it is possible that someone unfriended you; however, Facebook never ever sends notifications about unfriending.
See Who Unfriended You On Facebook
Unfriending
When another user unfriends you, you no longer appear on her friend list. If she has elected to conceal her profile material from non-friends, you may be unable to see parts of her profile that you previously had access to.
Even if you can still see her profile Wall, you will not be permitted to publish anything to it once you are not her friend on the website. The opposite is also real-- someone who unfriends you might not post brand-new material to your Wall.
Notices
Alerts are a way for Facebook to communicate with a user when there is brand-new activity associated with her account. While you are notified of practically every new action a good friend takes concerning your account-- such as sending you a message or publishing on your Wall-- unfriending is one of the few exceptions.
You will not get a notification, either on your Facebook Wall or by means of email, when someone unfriends you.
Reciprocity
When one of your Facebook pals unfriends you, she disappears from your buddy list simply as you disappear from hers. Due to the fact that of this reciprocity, you can browse your good friend list for friends that you suspect may have unfriended you.
If someone not appears on your buddy list however you see that her profile still exists, she has actually unfriended you.
Factors to consider
Simply since somebody vanishes from your good friend list does not mean she has unfriended you. It is possible that the user has deactivated her account, or that it was disabled by Facebook for some factor.
If you were unfriended and want to reconnect with the user, you can still send her a personal message or request her friendship again utilizing the suitable buttons on her profile page.
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