The One Direction heartthrob is said to have broken up with the Kardashian sister due to their work commitments, with him kept busy with the band and "focusing on her modelling".
Speaking to The Sun on Sunday newspaper, an insider revealed: "Kendall has been focusing on her modelling and Harry is preparing for work on the band's fourth album, as well as their stadium tour.
"The reality is that with everything they both have going on it's impossible to sustain anything serious."
Despite their recent break up, the pair are reportedly "still friends" after their relationship came to an end without any "major" arguments, and they could try again in the future.
The source added: "There's been no major fallout. They're definitely still friends and haven't ruled anything out in the future."
While his relationship might be over, the Story of My Life hitmaker recently insisted the group is as strong as ever with no plans to call it quits.
He said: "We're not breaking up. We've spent every day together for months and forgot what my mum looked like. It's just holidays."
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