By Caroline Gaspich Taylor Swift fans are raving over the “best duet over” after the music video for Fortnight featuring rapper Post Malone from her new album The Tortured Poets Department officially dropped. Swifties gushed over the chaotic and emotional black-and-white music video showcasing scenes of love and torture as Taylor seemingly navigates a devastating breakup. In a series of montages, Taylor and Posty are seen sitting in a stark white room as they frantically type away on typewriters as the words “I love you it’s ruining my life” are written over and over again while blue and orang…