She considered him a non-friend.

I prefer to spend time with my friends rather than non-friends.

I have many un-friends on social media.

She decided to un-friend him on social media.

She un-friended him on social media.

I consider him as my back-friend.

She is un-friending him on social media.

I had to un-friend him on social media because he was constantly posting offensive content.

I decided to un-friend him on social media.

I have many back-friends who always support me.