I guess I wasn't clear. In my polyamorous relationship (which is not an open poly, but more of a polyfidelity), I've found that having relationships with the same people that someone you are fighting with has relationships with keeps the fight from getting to the point of separation. A fight that may cause someone to leave your life instead causes them to keep their distance for some time.

I think of it as the other relationships you share attenuating the relationship stresses such that you are not torn apart from each other. Afterwards, they hold you in proximity like stitches on a wound, to allow you to heal.