It isn't too uncommon for Kourtney Kardashian's beau Scott Disick to say something that crosses the line.

But in Sunday's episode of Kourtney and Kim Take Miami, he crossed an emotional line when commenting on Kourtney's weight and her struggle to lose the post pregnancy pounds and made her cry.

"Just do it faster, you're my piece of machinery," Disick said to Kourtney Kardashian on Sunday.

Kourtney Kardashian had her and Disick's second child, Penelope, in September 2012. Since the second baby, Disick has been complaining about her appearance, and was telling her his ideal weight for her was when they met.

Kourtney weighed herself on the show and was 115 pounds and Disick commented on how she weighed just 93 pounds when they met.

He said on the show, "If I would have fell in love with you a couple of pounds overweight, this would be my ideal weight, but I fell in love with you when you were super skinny."

He also complained that she tried harder after Mason to lose the baby weight by saying she watched what she was eating last time. "This time around it seems like it's the least of her concerns, and the only thing she thinks about are the kids," he said on the show.

Disick took to Twitter on March 11, but not to apologize for his comments on Kourtney. He tweeted, "Never realized how upset people get when a person makes a comment about weight."