What is "unfriends"

Usage examples of "unfriends".

But no, I schooled my thoughts, I must not react so to everything he said as if we were unfriends and not life comrades, as we must learn to be.

If times were a bit hard, well, they would outlast it, and meanwhile they had work to do, households and communities to maintain, interests to pursue, pleasures to seek, love to make, errands to run, friends to invite, unfriends to snub, plans to consider, details, details, details like sand in an hourglass.