Kourtney Kardashian and her boyfriend, Travis Baker, are painting the town red. But while the couple’s chemistry is growing stronger every day, Kardashian’s ex-husband, Scott Disick, is getting very uncomfortable about it. Disick, who shares the responsibility of their three children with Kardashian, has always been supportive of her, but now since things have become very serious between Baker and the reality show star, Disick is having a really hard time adjusting to the new reality.

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A source told E!, “Scott has really distanced himself from Kourtney recently. Of course, they are still cordial when it comes to the kids, but they aren’t hanging out as much or doing things as a family. The communication has become strictly about the kids.”

“It’s uncomfortable for Scott to see Kourtney in a serious relationship, although he knew this day would come. He is glad she is happy, but it’s definitely been hard on him. He doesn’t like to bring it up and it’s a weird convo for him. At one point, the family was really encouraging Scott and Kourtney to try the relationship again and it’s a bit of an eye-opener for him, that it’s truly never going to happen,” added the source. Scott is clearly not able to ignore the chemistry and headlines surrounding the lovebirds.

Another source informed, “He is trying to adjust and be a grown-up about it, but seeing Kourtney get so serious with someone so quickly is not easy—especially someone they have known for so long. Scott has never been comfortable seeing Kourtney with guys, but this feels different.”

On one of the recent episodes of Keeping Up With the Kardashians‘ final season, fans watched the family members joke about Scott Disick and Kourtney Kardashian being single. Disick expressed being open to the idea of getting back together as he said, “I guess now that you’re single and I’m single and you haven’t been with somebody in a bit, either we figure out creating our own lives together or separately. It hurts me when you’re with somebody else.”