Could end in burning flames or paradise. Taylor Swift "doesn't have an issue" with her longtime friend Zoë Kravitz dating her ex-boyfriend Harry Styles, a source exclusively tells Us Weekly. "Their relationship was so long ago," the insider notes. "Harry has moved on, and so has Taylor. They're friendly when they see each other, which isn't often but does happen occasionally. It's all in the past now." Us Weekly has reached out to reps for Swift, Kravitz and Styles for comment.