The reason is kinda confusing, because there were rumors of Harry Styles, Taylor Swift's ex, and Kendall Jenner. It is interesting that Taylor Swift made this offer to Kendall Jenner, with whom she has always been on good terms, although she is obsessive about her exes. Unlike her close friend Gigi Hadid, Kendall Jenner doesn't plan on starring in music videos. Long story short, the reason she rejected Taylor Swift looks more like an excuse.