Calvin Harris Refuses To Collatorate With Girlfriend Taylor Swift

Well politely since he doesn't want to jinx their relationship following his bitter split with Rita Ora. According to The Sun,Calvin Harris politely declined on any collaboration with his Grammy winning girlfriend and popstar,Taylor Swift. The Source said;
“Calvin’s next single is ready but the label is keen for him to get a big female U.S. star to collaborate on it,” “They floated the idea of him working with Taylor but he politely declined it.”
Though the song would have been great,i think it's a smart idea. Taylor is also in on the keeping her private life and work life apart,so they are on the same page. They are also really cute together.