eternal triangle

/IH0 T ER1 N AH0 L T R AY0 AE0 NG G AH0 L/
noun
  1. 1

    A relationship involving three persons (usually two women and one man or two men and one woman) among whom there are conflicting and competing attachments of a romantic or emotional nature.

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Source: https://en.wiktionary.org/wiki/eternal%20triangle