Who is Taylor song Treacherous about?

The song "Treacherous" by Taylor Swift is believed to be about her relationship with actor Jake Gyllenhaal. The lyrics suggest a passionate but unstable romance, with Swift expressing both her attraction and fear of the relationship. The song mentions how the person in question is "so casually cruel in the name of being honest," which could refer to Gyllenhaal's reputation for being straightforward and sometimes blunt in his interactions with others. Other lines such as "your kiss, my neck" and "this slope is treacherous," could also be seen as references to their relationship. However, it's worth noting that Swift has never explicitly confirmed who inspired the song.