HEIDI KLUM is heartbroken after ex-husband Seal shot down her pleas to reconcile, sources tell The ENQUIRER.

The 40-year-old “Project Runway” judge is single again after splitting with bodyguard Martin Kirsten – but sources say she’s still hung up on Seal, 50.

Heidi dumped the British singer – and dad to their four kids – two years ago to pursue a steamy relationship with Kirsten.

“Heidi assumed Seal would take her back in a flash because he was so heartbroken when they split,” said a source. “But over time he learned to focus on his new life, and he’s just been photographed out and about with a new woman. No doubt he’d rather be with her than go back to tempestuous Heidi. In fact, he told Heidi she needs to look elsewhere for a man.”

It didn’t take her long. On Feb. 8, she was spotted getting cozy with Demi Moore’s ex-toy boy, 27-year-old playboy Vito Schnabel, in a Hollywood hotspot.

“Heidi was dev­astated when Seal turned her down, so she went out to party the pain away and hooked up with Vito,” explained the source. “But this is definitely a rebound. She’d rather be with Seal.”

Seal and Klum were married for seven years but endured a bitter bustup, with Seal famously accusing her of “fornicating with the help.” Eventually, they called a truce and were seen acting cordially at events with their kids Leni, 9, Henry, 8, Johan, 7, and Lou, 4.

“Seal has learned to forgive Heidi, but that’s more for the kids’ sake than anything else,” said a second source. “There was a time he’d have given his right arm to have her back, but now he’s over her.”