Eric Da Silva-Soares violently attacked three people in Spital Street during the evening of August 31 last year, shortly after making a threat for the woman to leave her partner.
At the time, the woman in her 20s, was with her partner and another man when she received a call from a friend.
She was told that Da Silva-Soares was in town and had threatened to kill them.
Around 10 minutes later, she saw the attacker approaching them and carrying a bag.
The 29-year-old then pulled a knife from his bag and stabbed the woman in her stomach and left arm.
Her partner tried to stop this but was also repeatedly stabbed.
Their friend tried to pull Da Silva-Soares away, but he was stabbed in the back.
Da Silva-Soares then continued to stab the woman’s partner again, including his face, before all three managed to escape to a fast-food restaurant.
Staff locked the doors and Da Silva-Soares fled the scene.
The three were taken to hospital and underwent surgery for their serious injuries.
The partner has been left with life-changing injuries after being repeatedly stabbed.
On September 1, Da Silva-Soares texted the woman saying his actions were unforgivable.
He then tried to catch a flight out of the country the following day, but officers stopped him at Edinburgh Airport.
Da Silva-Soares, of Wharfside Close in Erith, was charged and pleaded guilty at Woolwich Crown Court to two attempted murders and unlawful wounding.
Today (March 5), he has been sentenced to life imprisonment and he will have the serve a minimum of 12 years and 10 months before he becomes eligible for parole.
Senior Investigating Officer, Detective Chief Inspector Emma Lawry, said: “This was an appalling, unprovoked assault on three young people enjoying a night out in Dartford.
“Da Silva-Soares came to the town armed with a knife, intent on violence, and inflicted shocking injuries.
“The impact of the assaults will have a long-lasting effect on the victims. The two men who tried to tackle Da Silva-Soares showed immense bravery and all three victims should be commended for their courage whilst assisting our investigation.
“Da Silva-Soares has shown himself to be a very dangerous individual and it is only right that he is now starting a lengthy prison sentence.”
