She was in a love triangle
But it wasn't like my feelings weren't there to make it a square

from Cannibal Ox – The F Word Lyrics on Rap Genius

Meaning

A love triangle is between 3 people. Which means that she had two other love interests. He realized that he wasn’t even in her equation. if he was it could no longer be a triangle (3 sides).. must be a square (4 sides)

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