Taylor Swift and Joe Alwyn were dating since 2016. File

The portal was told "the relationship had just run its course. It's why (Alwyn) hasn't been spotted at any shows." Swift, 33, is currently on her The Eras tour, which heads to Tampa, Florida next week.

It wasn't so long ago when Swift and Alwyn were said to have been in a great place in their relationship. They started dating in late 2016, and a source told ET back in October that they were "doing great" and that their "relationship is super strong."

That update came just hours after Swift dropped her highly anticipated 10th studio album, Midnights, followed by seven additional songs released in her surprise 3am Edition of the album.

For his part, Alwyn, 32, told British Vogue in September 2018 that he's keenly aware fans always want to be in the know when it comes to his and Swift's relationship.

"I’m aware people want to know about that side of things," he told the magazine in reference to Swift. "I think we have been successfully very private, and that has now sunk in for people."

The singer's 2017 track Gorgeous off her Reputation album was also about Alwyn.

Fans at that time revealed on Tumblr that, during a secret Reputation listening session, the songstress "made us all promise that if anyone made any accusations of who this song is about, we will tell them it is 100 per cent about her angel boyfriend of one year. This isn't a secret. She wanted us to tell people."