BPD relationship impossibility exists in the dynamics of polyamory or monogamy.
People with all the patterns of BPD undiagnosed, or diagnosed both groups
untreated are not emotionally capable of anything that even remotely resembles
a healthy relationship.

While Polyamory and Monogamy have fundamental differences, when there is a person
with untreated BPD in any relationship the dynnamics at core collapse from the
relational efforts of the person with BPD, regardless of relationship types.