The 28-year-old reality television star and his 27-year-old model girlfriend started dating back in January, causing controversy due to the fact that Blac shares a young son with rapper Tyga, who is now in a relationship with Rob's half-sister Kylie Jenner.
Rob took to his Instagram page to set the record straight about the reports, signing off a lengthy caption explaining his actions with a newly coined moniker for the couple - ChyRo.
Alongside a cosy picture of him and Blac, Rob wrote, "Chy and I are not broken up we just feel like it would be a lot healthier for our relationship if we kept a lot more to ourselves. It's impossible to have a positive relationship with so much negativity from the media and outsiders and we would appreciate it if everyone respects that - ChyRo @blacchyna."