I am going to sum up. I might get it wrong. You correct me if I miss anything.
But to me here are the highlights as I see them. I quote just to visually block it off.
In your other thread, you were asking how to make better use of forums and improve your communication. I think writing more organized could help you get what you need more quickly. Not using nicknames and the ruminating writing style are fine... but if you choose that style then you have to accept that it might take people longer to "get" what you are trying to say. It can be hard to follow. I've been having a very hard time keeping up.
You might consider having a
blog thread where you work out your thoughts in "rough draft" and then post a summary to Poly Corner when they have come together more clearly. That could be another way to use the boards.
EXTRA DATA CONFUSION
I see that in writing you realized you are more RA, and then you were thinking about your ex-spouse and his friend.
You seem to be in a "take stock of my life" mindset. That is fine to do.
But I do not think it helps to keep the focus of this particular thread tight if you pile data from many life areas into it. I think some confusion entered there. You could keep one main thought per thread to help responders reply to you better.
YOU know your life story and how it all fits together. Others do not.
WORD USE CONFUSION
I think there might be a another confusion happening here.
I think part of the confusion in your posts are the words "agreements" and "personal boundaries." You seem to use them interchangeably. Are they the same to you? Perhaps taking a moment to calibrate word use is helpful here. They are different to me. And perhaps to other posters.
To me? That is an
agreement between you and Fern (your ex gf). To me? That is not a personal boundary you set up for yourself to obey.
You have recently arrived at a new personal boundary. That you don't want to get in the middle of other people's things and leave you in a crossfire. That part to me is the
personal boundary.
Other people don't have to obey it. They might even try to suck you into their drama. But YOU could obey it and stay out of it.
Other people do not have to agree with where you draw your limits. But you don't draw them to help
them. You set up personal boundaries to help keep you safe and free from shenanigans. You draw them and stick with them to help YOU.
CONCLUSION
I think it is fine to step back and let Fern and Holly sort out whatever. You don't have to be involved in all that. You could obey your new boundary.
If/when Fern actually has it together and is actually able to be friends with you, be friends who hang out at
that point in time.
For now, just be good exes who don't hang out as friends.
Hope that helps some.
Galagirl