Swift and Alwyn first met at 2016 Met Gala on May 2, 2016. However, they only got closer to each other in September, after being reintroduced to each other by one of Swift’s best friends Gigi Hadid. They became friends before they started dating in late 2016. Swift managed to keep their relationship in secret but seven months later, in May 2017, The Sun reported they were together after sources claimed that Swift had a new boyfriend.
Taylor and Joe both attended Kings of Leon secret gig on October 12, 2016. They left the concert separated (Joe left with Martha Hunt, who’s also friends with Taylor). Taylor also went to see a screening of Billy Lynn’s Long Halftime Walk (starring Joe Alwyn) on November 11, 2016. Fans only noticed those events after The Sun’s article which was posted on May 16, 2017.
On June 1, 2017, the first pictures of Swift and Alwyn together leaving the UK on her private jet were taken. On June 3, 2017, they were papped together at her house in Nashville.
Swift’s sixth studio album “Reputation” is mainly about her relationship with Alwyn. Songs like “...Ready For It?” “Call It What You Want” “Gorgeous” “New Year’s Day” “Delicate” and “Dress” were confirmed to be about him.
On April 13, 2018, Spotify released Swift's "Spotify Singles" which cointained a cover of “September” by Earth, Wind & Fire. Swift chose the song for sentimental reasons.
The original “September” begins with the line “Do you remember the 21st night of September?” But in Swift’s cover, recorded for the Spotify Singles series, she changed it to “Do you remember the 28th night of September.” And in her stripped-down arrangement, the change is crystal clear.
For a casual listener, the change might seem meaningless. But Swift’s fans knew exactly what it meant: It’s most likely a reference to her relationship with Joe Alwyn, which started on September 28, 2016.