Harry Styles
Harry StylesReuters

One Direction singer Harry Styles is said to have cheated on his secret air-hostess girlfriend Megan Smith with model Kendall Jenner. 

Styles and Smith were together for about nine months after the duo started a relationship shortly after meeting on a plane, while the British singer was on "On The Road Again" tour last year. Their relationship became serious soon after the band went on a hiatus, and Styles even supported Smith through some of her tough times.

"But unlike many of Harry's flings, this actually got really serious. He supported Megan through some tough times in her life and started referring to her as his girlfriend," a source told the U.K.'s Mirror. "Megan never asked him about other women because she accepted he was a rock star but she was madly in love and believed Harry felt the same."

A family tragedy brought the two even closer, according to the Sun. The publication noted that Styles was a real comfort to Smith when her mother suffered a stroke. He even took over her job and became the air steward himself so that she could have some time for herself.

However, their romance turned sour soon after Styles realised Smith knew about his tryst with Jenner. Smith wasn't happy that her boyfriend spent New Year's eve with Jenner on a yacht. According to the Sun, Styles was romancing Jenner just weeks before she went to stay with him in London.

"I had two great days with Harry but as I was leaving at the airport on the way back I saw the shot of him and Kendall together on the yacht," the Sun quoted Smith. "I was gutted. Literally, he had got off the boat with her and come to London to see me."

"He asked me what I did over New Years and I was like, 'I was with family' and he's like, 'I spent mine with friends and family.' I was like 'Oh, ok cool.' He blatantly lied to me about it."

Styles was previously linked to Taylor Swift and Caroline Flack.