Joe Alwyn wanted to keep his six-year romance with Taylor Swift “personal”. The 33-year-old actor and the 34-year-old singer/songwriter were in a relationship for six years before their 2023 split and kept the romance largely out of the public eye. A source told PEOPLE: “[The relationship] took a lot of people by surprise but he wasn’t showing off in some way.” The insider added that Joe wanted the relationship to remain “his own personal story”. However, Taylor has referenced the romance on her new album ‘The Tortured Poets Department’ with a song called ‘So Long, London’. She sings: “I stopp…