Lee Ferguson, 32, from Wallsend in North Tyneside, attacked Jade Jordan, who suffered burns to 13 per cent of her body and required surgery and skin grafts.
CCTV footage of the incident, which took place in the early hours of February 19, shows Miss Jordan’s torso and thighs ignite into a burst of yellow and orange.
The victim spent three weeks in hospital after the attack, suffered ‘deep’ burns to 13 per cent of her body and needed surgery and skin grafts.
She will be scarred for life around her stomach, abdomen and legs.
Ferguson admitted causing grievous bodily harm with intent at Newcastle Crown Court.
He sobbed in the dock as the footage of his attack and his aftermath was played to the court.
The court heard the couple, who had been together for 12 years and have two children, have stayed together after the attack.
Witnesses from a nearby pub had heard Miss Jordan ‘shouting and then screaming’ in the early hours and saw the flames.
Ferguson, who stamped out the blaze and covered his victim in a coat to try and stop the flames, was heard saying ‘I’m going to jail for a long time for this’.
After hearing at Newcastle Crown Court, Ferguson was jailed for eight years