I'm admin for a long-running WA group. Last year one of the early members of the group, a friend of mine, started a new relationship and twisted my arm very hard to add her partner of a couple of months to it. He lives 300 miles away and the group is based around local events and meet-ups, but she got very upset when I said that it wasn't appropriate and like a fool I added him. Six months later and it's all over, he's an arsehole, he's out of her life. But in the meantime he's made several friends in the group. My friend is increasingly distraught about having his name pop up in the group and insists that I remove him.
Is there an established etiquette for this situation? Do I contact him privately, say 'Sorry mate, but you're not local and not likely to be visiting this area regularly, so you're out?' Do I say 'As you're not going out with Molly any more there's no reason for you to be on this group?' Is there a way that I can mute him?