The 29-year-old is expecting his first child with the model and social media star, but he has deleted every photograph of Blac from his social media account - and unfollowed her.
Only a single photograph of Rob remains, and sources tell Media Take Out the move came after the couple had a major bust up on camera while filming his family's reality show, Keeping Up With the Kardashians.
While Blac temporarily unfollowed her fiance at the same time, the outlet reports she resumed following Rob on Monday morning.
The couple's last social media post together came last week, when Rob appeared to call the 28-year-old a "psycho b***h" after she seemingly scratched his arm in a Snapchat video.
"Look what she did to me. Crazy a**,” Rob said as he filmed his arm, before panning to Blac who looked unimpressed as she sat next to him.
The star then gave her fiance a smile and swiped the camera as he's heard calling her “psycho b****”.
Rob shocked his family back in January (16) when he went public with his new relationship with the mother of his half-sister Kylie Kenner's on/off boyfriend Tyga. The couple became engaged in April after a whirlwind romance, and stunned loved ones again by revealing Blac was pregnant a month later (May16).
The couple's representative has yet to respond to requests for comment regarding the status of Rob and Blac's relationship.