Zayn Malik is reported to have left the One Direction 'On The Road Again' world tour, due to "stress", after he pulled out of a commercial recording today in Hong Kong, flying back to the UK because of media speculation around his private life.

Zayn Malik and Harry Styles

Zayn Malik and Harry Styles

A spokesman for the band told The Sun newspaper: "Zayn has signed off with stress and is flying back to the UK to recuperate. The band wish him well and will continue with their performances in Manila and Jakarta."

His departure comes just hours after the 'Steal My Girl' hitmaker was forced to assure fans he had not cheated on his fiancé Perrie Edwards of Little Mix, having been spotted getting close with another woman while on a night out in Phuket, Thailand.

Taking to his Twitter account on Wednesday evening (18.03.15) he said: "I'm 22 years old... I love a girl named Perrie Edwards. And there's a lot of jealous fucks in this world I'm sorry for what it looks like x (sic)."

Zayn - who was to pay a £3,000 bond in order to enter the Philippines this weekend following his previous rumoured drug use - will now be absent from the band's next three performances in Asia, but is expected to rejoin Harry Styles, Liam Payne, Louis Tomlinson and Niall Horan for their show in Cape Town, South Africa, on March 28.

Speaking about the reasons for his temporary departure from the tour, a source said: "Zayn finds it tougher than the rest of his band-mates dealing with fame.

"Having his every movement scrutinised causes great anxiety and the pictures which surfaced with the fan yesterday was the final straw.

"He did nothing wrong but the amount of criticism he received was simply too much. He needs to get away.

"The band's management accept he needs some time off so he's been sent home with their blessing."