Disick's partying habit contributed to the couple's heated exchange over the weekend, reported Ace Showbiz.
"She didn't like it when Disick often left the house to party. They fight, get back together, he parties, she doesn't like it," a source said.
Kardashian is reportedly concerned about her boyfriend's love for partying because he always ends up fighting with others after a drinking session.
Kardashian, 35, and Disick, who are parents to a four-year-old son Mason and 23-month-old daughter Penelope, are currently expecting their third child together.