The director of the One Direction documentary This Is Us, Morgan Spurlock, has said that the boyband's former singer Zayn Malik "always struggled" with being on tour because he is such a "homebody".
Spurlock grew to know each member of the group very well while making the 2013 film and gave his assessment of Malik's departure to HuffPost Live.
The director said: "He wanted nothing more than to sit in his house and spray paint and draw and do art, and I think this explosion that happened to him - which was something none of them ever predicted - but I think he was the one who struggled with it the most.
"And being away, being on the road, being away from his girlfriend, I think, finally just got to him, and I think he said, 'I'm done'."
He added: "I love Zayn, Zayn is probably my favourite guy in the band. I thought he was amazing. He was a huge talent, probably the best singer in the group."
Morgan Spurlock