Simon explained how things started to unravel with Zayn, saying: "I kind of knew this was coming if I'm honest with you. We'd had a few conversations and he wasn't happy. I was trying to say to him, 'You should stay around a bit longer,' and then something in him said, 'No, I've had enough.' Once the decision was made I dealt with it, then obviously made sure the guys were okay because they were shocked as well."
Simon added, "Once someone has made their mind up, they're going to go. At the same time I didn't want to push him too much, he's 22 and I could see he was a bit stressed and needed some time off. I had to respect his decision."
Moving onward, however, Simon said One Direction still managed to carry on without Zayn, explaining: "For the boys, it was interesting as they were in the middle of these live shows at the time. I watched the show back and I've got to hand it to them, they were incredible...to work everything out so quickly, and they were amazing."
Guest Michael Douglas was also asked about Zayn leaving and he said he heard "there might have been somebody else involved in all of this." They all had a laugh over it, as Michael admitted he had "no idea" what he was talking about and was just trying to "stir it up a little bit."
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Gallery | One Direction's Instagram: Best of Zayn Malik