Keeping up with the Kardashians has accompanied the couple through their fair share of highs and lows, with Kourt standing by Scott through various rehab stints.
However the latest reported blow to their relationship may prove too much to handle.
According to radaronline, the 31-year-old has been criticizing the 36-year-old-year-old mum's body.
Kourtney, who is mum to Scott's three children Mason, 5, Penelope, 2, and 5-month-old Reign, is no stranger to her long term partner's harsh words.
In a 2013 episode of their reality show, she can be seen sobbing after Scott questions her weight after the birth of their second child Penelope.
"Last time around you tried to watch what you were eating, after you had Mason… At least you were losing weight. 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 was filmed saying.
And in an apparent dig at his girlfriend just days after pictures emerged of Kourtney in a bikini during their Mexican vacation, he posted a throwback picture of the star in a bikini in 2010.
Kourtney quickly reponded online, posting: "So after a fun vacation, it's time to get back on track. NEED to start back hard core in the gym..".
According to insiders Scott is a constant critic.
“Scott is always trying to remind Kourtney of how hot she used to be. It is totally unfair because she had three children that were his doing, and for her to be able to look like she did prior to having the kids is just impossible.”
“She is beautiful just the way she is and her friends are constantly telling her to just ignore his insults. But it is hard,” says the source.
“Ever since Scott got on his fake health kick which he just drinks a smoothie and thinks he is healthy he has been extra cruel towards her,” the source added.
“The sad thing is that she actually listens to his criticism and goes into a place in her head where she thinks she needs to be a size zero to keep him.”