I think there is definitely something in this question, thanks to the original poster. I came to the conclusion some time ago that my wife may well be a sufferer of Borderline Personality Disorder. I believe she always was but her symptoms and behaviours got worse as she got older.
That was the major difference between her idea of "poly" and that on here; she didn't feel constrained by any rules or guidelines or respect for any other individuals involved. And once unleashed, her own jealousies knew no bounds.
"The secret of life, though, is to fall seven times but to get up eight times"