Friends for over 30 years, so a significant length of time. I'm using fake names, obviously.
Beth upset Jane- something small but quite bad-mannered. Beth doesn't really accept that she was in the wrong in this first instance.
Jane let out about 20 years worth of niggles and resentment in response, some of which is valid, but also some that is not an accurate or fair view of the situation. Beth reacted angrily.
I've told both that I don't want to get involved, and they've both mostly respected that and not asked about each other to me. Both, however, are waiting for the other to apologise and have said they won't be apologising themselves because they each think they've done nothing wrong.
AIBU to just ignore it and see them separately from now on? Should I be doing more to resolve the problem?