The pair started dating in 2015, and made their love public with a pic of a pic on the photo-sharing platform.
She had also split up with USA pop heartthrob Joe Jonas, 28, just weeks before they got together.
One of Hollywood's biggest young couples has gone their separate ways.
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Hadid echoed Malik's fond sentiments, adding that she'll be "forever grateful for the love, time and life lessons" she shared with "Z".
Hadid, 22, and Malik, 25, met at a Victoria's Secret Fashion Show after party in November 2015, and had briefly broken up in June 2016.
The source went on to add, "They have insane work schedules that would put pressure on any relationship". He spoke to ES magazine and said, "She's a very intelligent woman". She's quite classy and that. "I want nothing but the best for him and will continue to support him as a friend that I have enormous respect and love for". She carries it well.
Hadid shared on her own message shortly after Malik.
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This isn't the first time the couple has broken up over the course of the past couple of years, either. Zayn was previously engaged to Little Mix singer Perrie Edwards.
"Love this man more than I could ever put into words, & am inspired by his drive to be and do better everyday", she wrote. She wished him a happy 25th birthday and confessed that how much she loves him. "I'm proud to be by your side x".
The couple, who were last seen publicly together in January, just celebrated their two-year anniversary in September.
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