Benjamin Berlemont had been told by his 28-year-old ex-partner, with whom he had a son of junior school age, that their relationship was over and that she was seeing someone else. Berlemont became angry and started to call and text her every day for ten days up to Tuesday, 29 December 2015 - even calling her on Christmas Day.
On seeing the new boyfriend, Berlemont broke through the door and forced his way inside.
Armed with a knife, he carried out a violent attack against the new boyfriend in the hallway and kitchen - at one point forcing him to the floor. Sutton police officers arrived swiftly and persuaded Berlemont to put down the knife.
The victim had deep cuts to the back of his head, near his left temple, his lip and left hand as well as a puncture wound to his right bicep. He was taken to hospital by ambulance.
Berlemont initially denied deliberately causing the injuries, stating he had been trying to look out for the welfare of his son.
But following a robust investigation into the full circumstances by detectives from Sutton Police's Community Safety Unit, Benjamin Berlemont, aged 27, (14.07.1988), of no fixed abode, was sentenced at Croydon Crown Court on Wednesday, 17 February to six years and six months imprisonment, issued with a Restraining Order until further notice and ordered to pay a victim surcharge of £120 after pleading guilty to aggravated burglary.
Detective Inspector James Carrington stated: "This was a violent and concerted attack which must have been terrifying for the victim. Our response to violence such as this was, and always will be, determined and robust."