I was thinking about boundaries and ultimatums. do you think the WAS had ultimatums in their mind before they walked away. I mean it seems logical.
You tell us--did she give you an ultimatum before leaving? An ultimatum would be telling you what to do. "You better change this, or else!" They aren't silent. You can't tell someone what to do silently.
My partner--and many WAS--discovered boundaries. Exactly what DB proposes. Mine told herself, "If we fight one more time, I'm leaving." Her boundary was silent. It didn't seek to control me. She wouldn't accept living in a relationship where we fought every day or even every few days.