Bianco, who played a Winterfell sex worker in the fantasy epic, dated the musician born Brian Warner in 2011, after meeting him on the set of an unreleased music video.
Speaking to The Cut, Bianco alleged that Manson inflicted cuts and bruises that left permanent scars on her body while they were living together.
She also claimed that Manson chased her with an axe and would repeatedly play her sex scene in Game of Thrones to guests in order to humiliate her.
Bianco starred in Manson’s Lewis Carroll-inspired film Phantasmagoria. Her work visa relied on the project, and as she explained to The Cut, she was worried that leaving Manson meant her visa privileges would cease to exist, so she stayed with him despite the alleged abuse.
“I think I would have made excuses for him,” Bianco said. “I was in survival mode at that point, and my brain had taught me to be small and agreeable.”
She eventually escaped while Manson was asleep.
“I basically felt like a prisoner,” Bianco said. “I came and went at his pleasure. Who I spoke to was completely controlled by him. I called my family hiding in the closet.”
Manson has denied the claims of abuse by various women, including Westworld star Evan Rachel Wood, and called them “horrible distortions of reality”.
He is yet to comment on the new claims by Bianco.
Last week, it was reported that Manson had been dropped by his longtime manager Tony Ciulla after 25 years.
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Soon after the allegations came to light, Manson was let go by his record label, Loma Vista.
He was also axed from the TV series American Gods and Creepshow.
If you or someone you know is experiencing domestic abuse, you can call the 24-hour National Domestic Abuse Helpline, run by Refuge, on 0808 2000 247, or visit their website here.