A source tells PEOPLE that although Kardashian, 41, and Disick, 37, are "not back together," the exes "are incredibly close."
On Sunday, Kardashian paid tribute to Disick with a sweet Father's Day tribute.
Kardashian's shout-out to Disick comes as the former couple has spent more time together recently, including a brief trip at the Amangiri resort in Utah in May.
And earlier this month, Kardashian and Disick — who split in 2015 after nearly a decade together — took their children out to lunch at Nobu in Malibu, California.
"They're taking a break right now, so Scott can just focus on the most important things in his life — his health and his kids,” a source told PEOPLE.
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In late April, Disick sought treatment at a Colorado treatment facility. However, he checked himself out and flew back to Los Angeles under a week after arriving, when a photo of himself from inside the rehab center was leaked online on May 4.
Since then, he has maintained a relatively low profile, although he has continued to spend time with his kids and Kardashian, with whom he has maintained a positive co-parenting relationship.
Disick is "committed to getting better" and "will do anything to help himself be the right type of man and father, but being somewhere where photos are released is not a safe place for him," a source told PEOPLE in May.
"He's looking into his next steps," the source added. "He's talking to a lot of people who can give him psychological, emotional, physical and spiritual health. He knows he needs all four."