Scott Disick is still getting used to his new blended family!

In a sneak peek clip for Keeping Up With The Karashians, Scott, 36, his ex and baby mama, Kourtney Kardashian, and his girlfriend, Sofia Richie, were relaxing in a hot tub in Finland.

While the ladies were clearly getting along fine, Scott started to feel very uncomfortable watching his ex and new lady, 21, together. The Flip It Like Disick star admitted he wanted to get out and Kourtney, 40, was quick to slam him for being so "negative!"

Watch the clip above! Keeping Up With The Karashians airs Sunday nights at 9pm, only on E!.