Friends and acquaintances have come and gone in my life. Some amicably, some... Not so much. But one thing I want to be clear about: My pain is not your pain.
If I have had a falling out with a person, I generally don't want other people involved if they weren't already involved before hand. I don't like losing friends, I get no pleasure in cutting off people I cared about so I don't like it when I'm not allowed to grieve. Talking about how 'bad' an ex-friend was, doing nothing but pointing out the negative, that doesn't help me. No, really, please don't find me and tell me what tiny, minuscule infraction bad ex-friend is doing now unless it's relevant. Maybe a little comeuppance where appropriate, or settling of concerns or fears, but really, they're not a part of my life, I don't need to know what they're doing with their lives unless it's to help me avoid them. If I have someone filtered out, there's a reason for it. Good things happened with those people, let me have that at least. Not everyone copes in the same way and that's fine.
Related to that, I do not care who are friends with my ex-friends. Those people might have hurt me but that doesn't mean it's the same for everyone. Other people are allowed to have different experiences with ex-friends than I had. Long as you don't try to force me to interact with them, I don't care. At most, there are some people I worry about being mislead or mistreated by a person, but if there has been change I'm not going to let personal experiences get in the way of that. (for the record, I don't negatively judge people who can't be friends with people who are interacting with an ex friend especially in an abusive situation) At the most I'll worry about people getting abused themselves by people that have hurt me, or I may not trust them as much, but can't really force them to 'choose'.
Interpersonal stuff is complicated.