Although Taylor and Calvin have yet to confirm the split themselves, a source told People.com: "There was no drama. Things just don't work out sometimes. No one cheated."
Taylor and Calvin celebrated their one-year anniversary in March
Things seemed to have been going well for the couple, who celebrated their one-year anniversary in March by baking a cake together, and Taylor discussed her relationship with the Scottish-born DJ in her May interview for Vogue, saying: "I'm just taking things as they come. I'm in a magical relationship right now. And of course I want it to be ours, and low-key… this is the one thing that's been mine about my personal life."
The 26-year-old star also included Calvin in a thank you speech at the iHeartRadio awards back in April, addressing him by his real name, Adam Wiles. She said: "For the first time I had the most amazing person to come home to when the crowds were all gone and the spotlight went out so I'd like to thank my boyfriend Adam for that."
Sources claim that there was "no drama" after the couple decided to split
The I Need Your Love DJ addressed fans for the first time after he was rushed to hospital following a serious car crash in May. News of the crash came from Calvin's team, who posted on Facebook: "Adam's transport was involved in a collision this evening on the way to the airport. As a result he will be unable to perform at Omnia tonight. He has been examined by doctors and told to rest for a few days."
After he was forced to cancel several gigs on doctor's orders, Calvin tweeted his fans: "Thank you so much for your messages and sorry to any disappointment I caused with the show cancellations. I'm feeling lucky and very grateful rn."
Taylor was also said to have missed the Billboard Music Awards after Calvin's accident.