The song is widely believed to be about Swift's ex Jake Gyllenhaal Taylor Swift premiered her sweat-inducing 10-minute version of her breakup song "All Too Well" on this weekend’s "Saturday Night Live." The song, first written by the songstress in 2012, is widely speculated to be about her ex-boyfriend, actor Jake Gyllenhaal, who she dated at the tender ages of 20 and 21 – and she didn’t hold back...