Hi YT, just popped on for a sec. this may answer question around triangulation.
Triangulation—the narcissist’s secret weapon
“Triangulation” can be defined as indirect communication where one person acts as messenger between two others, often times altering or fabricating the message to suit the tale bearer’s objective. Triangulation is a common tool of the narcissist and it goes hand in glove with “gaslighting”and “projection”
In the psychology of dysfunctional families, triangulation may take two forms: “[It] is most commonly used to express a situation in which one family member will not communicate directly with another family member, but will communicate with a third family member, forcing the third family member to then be part of the triangle.
“Triangulation can also be used as a label for a form of “splitting” in which one person plays the third family member against one that he or she is upset about. This is playing the two people against each other, but usually the person doing the splitting, will also engage in character assassination…”