After Entertainment Tonight (ET) posted that the 6-year long relationship between Taylor Swift and Joe Alwyn has ended, all other media outlets reported the same. The statement comes from "a source close to the couple", as per the People. The article quotes this mysterious source various times, but it is never clarified who the source is.
Here are some quotes from the People's article: (Taylor Swift and Joe Alwyn's Breakup: Everything We Know (people.com))
""They've had rough patches before and always worked things out, so friends thought they would take some time apart but eventually come back together," the source said, noting that "ultimately" Swift and Alwyn "weren't the right fit for one another."
The source added that Swift's superstardom was another factor in the split: "Joe has struggled with Taylor's level of fame and the attention from the public.""
These are bold statements but haven't been backed up by either Joe Alwyn or Taylor Swift. The couple has not made an official statement regarding the breakup yet. Swift is currently on her Eras' tour.
The only thing is, no comment from the couple may make it seem like they have actually broken up. But that is also speculation at best.
Most of the "news" articles surrounding this breakup seem to base themselves on an unknown source and lots of speculation. Another point of speculation in the People's article: "In early April, a source close to the couple revealed that their breakup happened a "few weeks ago," though the exact timing wasn't specified. Around that same time, Swift notably changed the Eras Tour setlist on her March 31 stop at AT&T Stadium in Arlington, Texas, swapping out Folklore's sweet paean to soulmates, "Invisible String," for the nostalgic look-back at a lost love, "The 1," from the same album." The change in setlist is a very unreliable way to draw inference about such a thing.
Hence, it may still be too early to say if they have broken up or not.