The singer made the revelation in his new self-titled autobiography, which is already making his fans sob uncontrollably.
The 23-year-old also said that his relationship with then fiancée Perrie Edwards was “breaking down” at the same time.
In his book, Zayn said: “It was March 2015. I had been in a bad place for a while and I didn’t see myself getting out of it unless I made a change.
“My relationship with my fiancée, Perrie, was breaking down. To make matters worse, there were so many crazy stories flying around in the newspapers about us, and it felt like such an invasion of privacy, it made me just want to disappear for a while.”