Jen Armstrong slept with a knife under her pillow long after her husband was convicted of domestic violence-related offences.
"He still made threats," the mother of young children told reporters in Sydney.
"I was so worried he could come over the balcony at any time."
The NSW government announced on Saturday it would double funding for domestic violence prevention in this month's state budget to $300 million over the next four years.
Nearly $3 million will go to an Australian-first trial, involving fitting GPS tracking bracelets on high-risk offenders.
Victims will also be given the opportunity to have their own GPS units, which will notify police if they get within a certain distance of their abusers.
Ms Armstrong said the new system would have greatly changed her situation and helped keep her children safe after she left her former partner.
"It would have changed my life," she said.
"And it really would have helped me making that step to becoming a survivor from a victim a lot quicker."
The government's package also includes $53 million for a statewide rollout of the Safer Pathway program, which works to give high-risk victims consistent help and prevent them bouncing from service to service.
Minister for the Prevention of Domestic Violence Pru Goward said Safer Pathway, together with a $34 million court advocacy program, would help stop women having to tell their frightening stories numerous times.
"They get so worn out and retraumatised by that constantly having to tell their own story that actually a lot of them find it easier not to do it," she said.
Among the other initiatives in the package are a $20 million domestic and family violence innovation fund and $22 million for police high-risk offender teams.
Previous histories will be considered when evaluating whether a person charged with an offence is high risk.
NSW Assistant Police Commissioner Mick Fuller said the police response to domestic violence was moving towards a focus on prevention.
"In the past we've focused on the perpetrators after they've committed their crimes," he said.
"This is about the perpetrators before they commit their next crime."
It's thought one in four women have experienced violence by an intimate partner.
There were 29,000 incidents of domestic violence-related assaults in NSW in the year to December 2015, the government says.
