Colman Domingo breaks down Ali's quest for revenge in the 'Euphoria' Season 3 finale.

Euphoria season 3 ends with the drama's most crushing loss in a plot that shockingly uses Rue to further Ali's story through a revenge fantasy common place in Westerns.

The ‘Euphoria’ series finale delivers a sad end to the story of Rue’s (Zendaya) addiction—here's why it happened the way it did.