If a poet wanted to write love poem that ended with surprising twist what poetic form would best fit this function?

Villanelle

A villanelle is a 19 line poem following the rhyme scheme: ABA ABA ABA ABA ABA ABAA with repeating line A at lines 6, 12, and 18, and repeating line B at lines 9, 15, and 19. This form can build dramatic structure and tension towards a satisfying end of an unexpected twist.