Jhangir Rasul, 40, even threatened to throw acid in the face of the woman he was in a 10-year relationship with.
His former partner told the court she would “rather die slowly than at his hands,” after admitting she “endured rather than enjoyed” the relationship with Rasul.
Prosecutor Michael Brady said Rasul was asked to leave the woman’s home in Cheetham Hill, when he grabbed her head and ‘whacked’ it against the staircase.
Brady then described how Rasul pulled the victim off of the floor, hit her head against the door and the floor, and “scratched at her eyes”.
Rasul is said to have then stamped on her head while screaming.
In a statement, the victim, who had two children with Rasul, said she “thought she was going to die.”
Days later she asked if she could go to the hospital because her face was swollen and she was still in “considerable pain”.
Rasul said she could go but she had to make up a story explain the horrific injury, she told doctors she had been in a fight with a friend.
“If I do, I will do it in a very clever way and you wouldn’t know it was me”
The ex-cop returned to her home on April 26, threatening his “nephew was going to smash her phone” unless she handed over money.
He then went to the kitchen and grabbed a knife, waving it at her and pressing it up against her neck.
Rasul told her: “B**** I’m going to kill you.”
Desperate, the victim asked him: “How can you do this to someone you love?”
He replied: “I don’t love you. I’m going to throw acid in your face.”
The victim tried to reason with him and told him he would go to prison for the attack.
He said: “If I do, I will do it in a very clever way and you wouldn’t know it was me.”
Rasul then launched into a tirade of verbal abuse, calling her a “sl** and a h**” and threatened to “get his mates to s**g her.”
She then waited until he fell asleep downstairs and called the police the following day.
The court head how she was “’sick of living in fear” and “hates looking at herself in the bath because she is so full of scars”
Judge Michael Leeming sentenced Rasul to 26 weeks in prison and granted the victim a restraining order indefinitely.
The judge told Rasul, of Pleasant Gardens, Bolton: “Being a former police officer, you should be fully aware of the effect of domestic violence on the innocent.”