It hurts, especially when the realization that they weren't truly good friends hits you.
^^^ this
I didn't give them up. They gave me up. The gossip let out by the elders invoked the cult-ivated phobias and scared them all off. They're afraid of me and how I might influence them.
I would be angry with them if I didn't understand that they're manipulated and indoctrinated. You can resent and hate the Borg collective without hating the individuals enslaved by it. But it isn't easy, especially at first.
Making new friends helps a lot. We've done that to an extent and gotten our kid involved in normal activities and it makes a huge difference.