Jake told The Sun recently (via 3am): "I think he's a f**king idiot. The way he's treated her is horrible. He's not a very nice man."
Wow. And that's someone with insider info, considering he recently got engaged to Perrie's Little Mix bandmate, Jesy Nelson.
Jake added, "Professionally he's talented but - and I'm speaking from what I've seen - he should be ashamed."
He specifically addressed the rumors that Zayn broke up with Perrie via text message, saying, "It's disrespectful." Agreed.
We're honestly surprised that Zayn hasn't fired back with some kind of shady subtweet directed at Jake before launching into a full-on Twitter feud.
Then again, maybe he's taking a page from Simon Cowell's rulebook, as he recently talked with The Mirror about some of the ish that can go wrong with social media.
Si explained: "I don't like this Twitter stuff, it's kind of like 'you are always going to regret what you send out on Twitter.'"
His advice for Zayn? "Just maybe keep quiet for a while, make a great record and enjoy life. Just that."
Preach. Keep that cray drama to a minimum, Zayn.