We will discuss some ways to avoid a breakup or (perhaps) mend it.

Some breakups are permanent situations in which you will likely never see that person, couple or ? again. Unlikely in the poly community unless they live in another state. Perhaps not even then if you attend same science fiction conferences, poly conventions, Live the Dream meetings etc.

Some breakups involve seeing the other person or people frequently if you share children, grand kids, close friends/water kin and other personal or business connections.

Poly relationships are less breakable if they bend.
A transition may be better than an end.