Sources told Page Six that Isaacs cheated on Blige with Starshell, 28, an up-and-coming artist Blige signed to her Matriarch Entertainment record label.
“Everyone knew. Mary was the last to know, but it’s like, how do you not know?” a source told us.
Another source added, “It was more like one of those things where you end up believing what you want to believe. But Mary had her suspicions.” Blige, 46, often brought Starshell to red carpets, events and TV appearances to build the burgeoning artist’s profile.
“It’s really f – – ked up and low to have it done to her that way. Had it not been for Mary signing her, investing time and money . . . Because no one cared about her music,” the first source said.