The couple, who have three children, Mason, five, Penelope, three, and eight-month-old Reign together, split in July after Scott was photographed partying with an ex-girlfriend in the South of France, and despite being urged to move on by her family, the 'Keeping Up with the Kardashians' beauty ''still hopes their relationship can work.''
A source close to the 36-year-old star said: ''Kim, Khloé and Kris have spent forever begging her to move on. They'd almost disown her if they found out. So they've been hooking up behind everyone's backs.''
Scott, 32, has been spotted spending quality time with their children in recent weeks, but the insider said: ''He's not just picking up the kids, he's spending whole days with them and Kourtney.''
The entrepreneur is determined to win his long-term girlfriend back for good.
The source told Life&Style magazine: ''He'd spend every day at the house if he could. He misses her and wants to get back together.
''They'll continue to have horrific arguments but Kourtney has a weakness for Scott. None of us would be surprised if they got back together full-time.''