Paul Henry carried out a campaign of fear against his former girlfriend for years before trying to kill her hours after he walked free from court.
Terrified Claire Boswell had made 40 complaints to police about Henry since 2005.
He ended up in magistrates' court in breach of an order, preventing him from harassing her, in September last year.
He had climbed on to her roof and threatened to kill her. He was given an eight-week prison sentence but this was suspended. Once free of the court room in Lincoln, he called Miss Boswell, 44, telling her "I'm out".
While most people in Miss Boswell's street would have been settling down for the evening, Henry had taken the train to Gainsborough. Once there, he broke into her home in Glentham Road and stabbed her.
Henry now faces being jailed indefinitely after a jury at Lincoln Crown Court found him guilty of attempting to murder Miss Boswell by an 11-1 majority verdict.
The jury had heard how Henry harassed her for years before it escalated into an attempt to kill her.
The ordeal Miss Boswell suffered, on September 15 last year, began when Henry used a plant pot to break into her home. Robert Underwood said Henry ran upstairs after Miss Boswell, swearing and shouting: "I'm going to kill you."
She retreated into her daughter's bedroom but Henry clambered over the bed with a knife taken from her kitchen.
"He went into the bedroom where Claire Boswell was. She was pressing an alarm button that the authorities had provided for her on an earlier occasion," said Mr Underwood.
Miss Boswell then dialled 999 and was heard shouting during the call: "Help! Get out!"
"Mr Henry was simply not deterred," said Mr Underwood.
He thrust the knife to the right side of her chest.
When interviewed by police, he admitted breaking into her house and getting a knife from her kitchen, but said he just intended to talk to her.
The wound penetrated her breast tissue and injured her liver, causing her life-threatening injuries.
She suffered a pierced liver and was taken to Lincoln Hospital, then transferred to Queen's Medical Centre in Nottingham where she remained for five days.
Adjourning sentence until November, Judge Michael Heath told Henry he needed a report from the probation service to help consider the level of danger he posed.
Judge Heath warned Henry: "I am considering passing an indeterminate sentence for public protection."
Henry had told police: "I didn't want to kill her or 'owt like that."
The jury were told Henry had a string of previous convictions for violence, including grievous bodily harm, assault and using a knife to cut the fingers of a male relative of his then girlfriend.
Henry, formerly of Lea Place, Gainsborough, was remanded into custody and will be sentenced on November 9.