Social media can be so odd.. in that it can have a negative impact on your mental state unexpectedly.
Just noticed someone I was once friends with has clearly unfriended me. I have no idea when or why. We still have a lot of mutual friends. No hard feelings - we were colleagues some years ago and have both moved away from where we worked. This is the kind of thing I used SM for - staying in touch virtually with people that you were once close to but life has meant you've taken separate paths. Oddly found it hurtful that I've been axed but some others from this "era" /workplace have not.
I noticed something similar with someone else recently. I didn't know I'd been unfriended. They were tagged in photo uploaded by a mutual friend. Clicked on them, noticed we are no longer FB friends.
I don't delete people (neither do I add to be honest). So it seems a shame that people have added and deleted me. Which made me wonder who else may have done this... is there a way to find out? I think you used to be able to "view friendship"