A teenager walks her ex-boyfriend, 32, down her driveway while comforting him after a messy break-up. What happens next sent him to jail for nine years and will leave you feeling sick to your stomach

Sickening footage has captured the moment a FIFO worker launched a frenzied knife attack on his teenage ex-girlfriend moments after she broke up with him.  

Mark McLean, 32, was on Tuesday jailed for nine years after stabbing his 19-year-old ex-girlfriend in the chest outside her home in Balcatta, northern Perth on March 24. 

The couple had been dating for four months but a drug-addled McLean attacked the young woman when she told him 'I can’t do this anymore, you are too full on'.

CCTV vision showed the teenager walk her estranged boyfriend down her driveway while rubbing his back affectionately in a bid to calm him down.

But in a split second his mood changed and he pulled a knife out of his waistband before carrying out a horrific act of domestic violence that almost killed her.  

CCTV vision showed the 19-year-old walk her former boyfriend down her driveway before the violent attack that led to him being jailed for nine years

The footage showed him then pulling her towards the footpath and slamming her onto the concrete - only fleeing the scene when a neighbour came to her aid.  

After the attack, McLean posted intimate photos of his former partner online. 

The couple began dating after meeting online and McLean had fallen 'madly in love' with his victim, The West Australian reported.

She took him to hospital the night before the attack after he threatened suicide. 

But McLean discharged himself from hospital and was on meth, ecstasy and diazepam when he broke into the woman's home the next morning. 

He kicked down her door and was wielding a knife as he began to make threats. 

The woman grabbed a knife already in her room and was able to settle McLean, convincing him to hand over his weapon.

He obliged and she put both knives under her bed. 

Mark McLean, 32, stabbed his 19-year-old ex-girlfriend outside her home in Balcatta, Perth, on the morning of March 24

McLean then pulled his victim towards the footpath and slammed her onto the concrete

McLean left the home but returned a short time later. He was calm until the woman said: 'I can't do this anymore, you are too full on'. 

He then pulled out another knife - which was hidden in his waistband - and stabbed her after he told his victim no one else could have her if he couldn't .   

He pleaded guilty to a charge of 'with intent unlawfully to kill, committed an act or omission likely to endanger human life'. 

Defence lawyer Richard Lawson told the court McLean fell madly in love with the woman and was 'desperate' to make the relationship work.

 McLean told his victim 'if I can't have you, no one can' before stabbing her

'She was 19, he was 31. So he was at that age where he was looking for something more permanent. The complainant on the other hand did not have the same intense feelings... wasn't that keen,' Mr Lawson said.

Mr Lawson said his client became 'extremely distressed' and started using meth when the woman said she wanted an open relationship. 

His behaviour became more 'intense, volatile and erratic', Mr Lawson said.  

Prosecutor Nicholas Cogin said the victim had tried to help her attacker but 'her life was severely affected by this drug-induced condition that he continued to persist with'.

Mr Cogin said it was 'drug-induced mental health problems' that sent McLean out of control. 

McLean was jailed for nine years on Tuesday but will be eligible for parole in seven.