There's a reason why "exile" and "evermore" hit right in the feels. Taylor Swift is finally opening up about what it was like to co-write songs with her boyfriend Joe Alwyn—and why they love creating "sad songs" together.

The Grammy winner previously revealed on her Disney+ studio session that he helped her write "exile" and "betty" on folklore, as well as three of the most gut-wrenching songs on her new evermore album, under the pseudonym William Bowery.