When you remove a Facebook friend, they won’t be notified. Instead, you’ll no longer appear in their news feed or Friends list and vice versa.
How to Unfriend Someone in the Facebook App
If you’re one of the many who use the Facebook mobile app on Android, iPhone, or iPad, you can manage your Friends list there, including unfriending someone.
How to Unfriend Someone on the Facebook Website
It’s just as easy to unfriend someone on the web. Head to the Facebook site, sign in, and follow these simple steps. If you decide later that you’d like to re-friend someone you unfriended on Facebook, you can simply send them a new friend request. Remember that if you want to take unfriending a step further, you can block users on both Facebook and Instagram.