Reveal magazine (via Daily Star) reports that Harry and Zayn were on the phone 24 hours ahead of the announcement and Harry was doing his best to keep Zayn from jumping ship.
An insider tells the mag: "They were both in floods of tears. Harry was hoping to talk him round and get him back on the tour. He had no idea he was going to drop the bombshell and say he was leaving."
The source added: "Zayn said, 'It's my life with Perrie or my life with the band. I can't do both. I can't go on.'" We're not entirely sure how someone would have that particular insider detail, but if this is true, it's absolutely heartbreaking to imagine the two of them broken down in a puddle of tears.
And then there's proof that the 1D friendship carries on after Zayn left (is he wearing Harry's ring around his neck?):