Maddie Durdant-Hollamby, 22, was killed by Ben Green, 41, at his home in August before he stabbed himself to death.
Maddie's parents, speaking for the first time, have claimed that she wanted to end her relationship with Ben on the night that he murdered her.Mum Rachel, 46, said: "We think she actually probably wanted to be able to come home later that evening and say 'I've ended my relationship with Ben and I'm going to go on holiday next week and have a great time.'"
She added that the couple were arguing about Maddie going on holiday without Ben before their bodies were found at his home in Kettering, Northants on August 27.
Rachel described Maddie, who lived with her parents in Wimblington, Cambs, as the "perfect daughter, perfect friend".
An inquest heard last month that Maddie met killer Ben, a marketing director, at a water management firm in Kettering before she got a job in marketing at a construction company.
Rachel told the BBC that she became concerned about Maddie on August 27 when one of her friends asked why she hadn't joined a group call the previous evening.
They then learnt that Maddie had missed a work meeting and one of Maddie's friends went to Ben's house on the same day before calling the police when there was no answer.
Police arrived to find the bodies of Maddie and Ben alongside one another, each with stab wounds.
Maddie's dad Steve, 48, said that there were no signs of domestic violence between the couple.
A family statement released via police after Maddie's death described her as a "beautiful person both inside and out".
It added: "Our hearts are broken and we cannot begin to imagine life without her. The shock and pain we are feeling is indescribable. Maddie was a kind, caring, thoughtful young woman, who touched the lives of everyone she met.
"A talented dancer, her creative talent continued through school and into her career in marketing. Her life has been sadly cut short just as her career was blossoming. Our thoughts are with everybody who knew and loved Maddie as much as we did."
Maddie's family held a 'party-themed' funeral for her in September, where guests were asked to avoid black clothing and instead "dress to impress".
A full inquest into both deaths is scheduled in January.