"He's not going to settle down. She's being more careful this time," a close Jenner source tells PEOPLE exclusively

By Melody Chiu
Updated September 12, 2016 07:15 PM
Credit: Jeff Kravitz/AMA2015/FilmMagic; Jason Merritt/Getty Images

Kendall Jenner and Harry Styles are giving romance another try, but the duo are still taking things slow.

According to a source, the model and singer are “not officially back together” but are “continuing to talk and see where things go.”

And though Jenner, 20, remains “hopeful” about her rekindled relationship with Styles, 22, the Keeping Up with the Kardashians star is also “being more careful this time,” adds the source.

“He’s not going to settle down and she understands that’s just the way he is,” says the source. “She really likes him, but her heart’s not as invested.”

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Last week, a source told PEOPLE exclusively the former couple went on a dinner date at L.A. hot spot Ysabel, where Jenner was spotted “beaming” all night long.

“They’re rekindling their old romance and Kendall’s so excited and happy about it,” said the source. “She’s always cared about Harry.”

The pair were first linked in January 2014 when they were seen going out to dinner and hitting the slopes at Mammoth Mountain in California.