One Direction songwriter Jamie Scott has revealed that Zayn Malik decided to quit the band because he was never able to spend enough time at home with his loved ones. 

Speaking to the Sunday Mirror, Scott explained that 1D's endless tour schedule was the nail in the coffin for the superstar and he left the boyband because being on the road all the time wasn't making him happy:

"Zayn went because he'd had enough. Have you ever been on the road for four years? These guys aren't at home. There is no way the same thing is going to run through all five guys, that they're all going to want to be on the road so much together. Eventually he got to a point where he'd had enough."

"It was, "OK, I don't want to be in this band any more". It was that simple, it was human instinct kicking in. People want it to be complicated and have secret reasons but that is what it was."

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Check out Scott's 'Unbreakable' below: