Friends of the 23-year-old stylist, who has an 11-month-old son Freddie with the singer, said living under the constant scrutiny of her former boyfriend's supporters has been a nightmare for her, reported Femalefirst.
One of her close friends, Luke Poole said, "Of course Briana loves Freddie but it's definitely been a nightmare at times. It's tough - she's taken a lot of thing personally..."
He added that how difficult it was for Brianna to handle the pressure and abuse.
"When people said the baby was fake, that made Briana feel like less of a person. She's trying to focus on being a mum, she's got a lot of pressure on her," Poole said.
Freddie was born to the couple on January 21, 2016.