The 35-year-old TV star has been dating the 31-year-old hunk since 2006, but posted quotes from the Disney film 'Lilo & Stitch' accompanied by a heartbroken cryptic image on Instagram, reported Hollywood Life.
The text read: "If you want to leave you can. I'll remember you, though. I remember everyone that leaves."
The couple - who have two children, Mason Dash, four, and Penelope Scotland, two, together - are set to welcome their third child into the world next month, but have been going through a tough few months due to Scott's erratic behaviour.
"He's just, like, severely depressed. He just makes up whatever, like, pills he thinks he needs to take and then if you drink with that I don't think it's good. And just stuff like that," Kourtney had said.
Kourtney is planning on ending their relationship after Christmas.
"Now she is about to give birth and has been holding onto hopes that he is going to stop drinking for good. Kourtney is due before Christmas, and there's a good chance she'll dump Scott after the holidays," a source said.