The Rixton frontman, 22, has slammed the former One Direction member in a very public way. And we're just waiting for Zayn's comeback. Because there's bound to be one!
Jake, who is engaged to Little Mix's Jesy Nelson, reveals he has a BIG issue with the way Zayn has treated Jesy's bandmate Perrie Edwards.
In an interview with The Sun, outspoken Jake doesn't hold any punches.
He says: "I think he's a f***ing idiot. The way he's treated her is horrible. He's not a very nice man. Professionally he's talented but - and I'm speaking from what I've seen - he should be ashamed."
Zayn is said to have broken off his engagement to Perrie - who recently broke down on stage mid-performance - with a single text message.
He has since been criticised for some apparent digs at his ex on Twitter, including a post asking social media users to retweet if they liked Fifth Harmony's song 'Worth It' or favourite the message if they preferred Little Mix's 'Black Magic'.
Jake added: "I'd at least send an email! It's more formal. But it's not about treating a woman like that, it's about treating a human like that. It's disrespectful.
"And the whole re-tweeting thing. He finished with her! Why antagonise it? It's done! It's a shame. He's talented but he's spoiled it."
Earlier this month, Jesy make her own dig at Zayn when performing Little Mix's number one hit Black Magic.
During the acoustic version, Jesy made sure to point at Perrie when Jade Thirlwall sang: "... just to help him see what he's been missing."
Perrie has kept a dignified silence, only confirmed she is "okay" and telling James Corden on his US talk show: "I wake up every day and thank my lucky stars I have these three girls."
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