Scott Disick is on a mission to win back Kourtney Kardashian and his family, recently proposing to the reality TV star in a move that left even her in utter shock.

According to Hollywood Life, the 36-year-old Kardashian received the shock of her life when the now sober Disick popped the question just four months after the two bitterly split amid rumors of his infidelity.

"Out of nowhere, he cornered Kourt and popped the question," a source said. "She told him she's not ready to forgive him yet. He made a joke about wearing her down. It's only a matter of time before he asks her again."

And it looks as if the 32-year-old Disick might get his chance, as the two are rumored to have recently been spending more and more time together.

Disick recently spent 30 days in a residential rehab facility and is now reported to be enrolled in a 60-day out-patient program. Since being released, he reportedly has been on his absolute best behavior.

The father of Kardashian's three young children recently placed his $4 million Beverly Hills party pad on the market. He has reportedly moved into the same neighborhood as Kris Jenner and Khloé Kardashian, just a stone's throw away from Kourtney Kardashian and his children.

After nearly a decade, the two split earlier this summer when Disick was spied openly cavorting with ex-girlfriend Chloe Bartoli in Monaco over the July Fourth holiday weekend. Since then, he has also been romantically linked to teenage model Lindsay Vrckovnik.

Several media outlets recently reported Disick is now swearing to Kardashian that he was never intimate with any of the other women.

"Scott has opened up to Kourtney about everything that went down," a source said. "Although he admits he made some major mistakes, one thing he denies is having slept with Chloe, Lindsay or any other girl."