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Triangle rule
(fedia.io)
Be sure to follow the rule before you head out.
Rule: You must post before you leave.
The classic love triangle was with Arthur, Lancelot, and Guinevere, where both guys wanted the girl but were also best friends. Does that not qualify?
That is the standard of the love triangle. The two love rivals have to be friends with, or at least know, each other or else there is no tension between them for their love of the 2nd party. Or else every person talking to multiple people on dating apps is in a love n-gon. And love should never intersext with n-gons.