Jonathan Wainwright became angry after his then partner mentioned she had taken part in a Facebook quiz, Leeds Crown Court heard.
Prosecutor, Olivia Murray, said Wainwright, 32, had been eating pizza with his partner at her home in Bramley when he became violent after she mentioned the quiz just before 1am on June 17.
Miss Murray said: "He picked up the pizza and started to rub it in her face and hair. He was shouting 'I will kill you.'"
Miss Murray said Wainwright, of Westerton Road, Tingley, put his hands round his victim's neck and said "I will snap your neck."
The court heard Wainwright repeatedly punched the woman to the stomach and chest
Miss Murray said: "He threatened to break every bone in her body. He grabbed her wrists and bent them backwards.
"When he went outside she locked the door so he couldn't get back in and contacted friends who contacted police."
Miss Murray said Wainwright told police he had drunk ten cans of cider and had taken cocaine.
Wainwright was found guilty after a trial at Leeds Magistrates' Court of assault by beating in connection with the June 17 attack.
He was also found guilty of assaulting her causing her actual bodily harm on December 31 2017.
The court heard that attack at her home happened after Wainwright had been drinking cider.
Miss Murray said Wainwright rugby tackled the woman and threw her off the sofa, causing her to hit her head on a radiator.
She suffered painful ribs and bruising to her jaw, right arm and back.
Mitigating, Kate Batty, said Wainwright is an alcoholic and his ex partner accepts that she is an alcoholic, adding: "It was never going to end well and was a recipe for disaster.
"The fact that he isn't able to accept where he has gone wrong is down to his alcoholism and is at the root of his offending."
Judge James Spencer QC jailed Wainwright for 14-months.
- An earlier version of this story reported that Wainwright had pleaded guilty to the offences.
We have amended this to correctly state that he was found guilty after a trial at Leeds Magistrates' Court.