Mr Wells-Burr also recalled witnessing Mr Nowak cry when he thought Miss Wells-Burr was going to leave him, months before her death.
Miss Wells-Burr and Mr Nowak both worked together at cleaning equipment manufacturer Numatic's factory in Chard alongside Miss Wells-Burr's parents.
The prosecution alleges Mr Nowak hatched the plot with his former lover - with whom he is accused of rekindling a romance - and her uncle to get his hands on Miss Wells-Burr's six-figure life insurance policy, Bristol Crown Court was told.
Later that morning, Miss Wells-Burr's body was discovered in the burnt out remains of her car.
It is alleged Rafal Nowak smothered Catherine Wells-Burr in order to claim a six-figure life insurance policy.
He said he later returned home with Miss Wells-Burr's parents where they found no trace of her.
He explained that before he left for work the following morning, he had kissed Miss Wells-Burr goodbye.
Miss Wells-Burr's body was discovered by fire crews in her Ford Focus in a field in Ashill.
Rafal Nowak, 31, told Catherine Wells-Burr's mother, Jayne, that he had "lost his world and his future".
Mrs Wells-Burr said Mr Nowak was treated like a member of their family and he called her "mummy".
Rafal Nowak, 31, denies murdering Catherine Wells-Burr, 23, as she slept at their home in Chard, Somerset, last September.
He told the jury that he had given the booklet to Miss Wells-Burr.
Rafal Nowak, 31, is accused of killing his partner Catherine Wells-Burr at the home they shared in Chard, Somerset.
Richard Smith QC told jurors that Miss Wells-Burr went to bed as normal on the night of 11 September.
Bristol Crown Court heard Mr Nowak deny smothering Miss Wells-Burr or arranging her death while being questioned by his lawyer.
Mr Nowak told the court he had rung Miss Wells-Burr's mother Jane when her daughter had failed to turn up to work.
Former inmate Anne Joyce, 21, was allegedly told about the camera in Ms Wells-Burr's bedroom at her home in Chard, by Ms Lagwinowicz.
The jury was also shown a letter written by Ms Lagwinowicz purporting to be from a "hit man" hired to kill Miss Wells-Burr.
It is alleged Rafal Nowak smothered Catherine Wells-Burr, 23, in September as part of a plot to claim her six-figure life insurance policy.
Earlier during questioning, Mr Nowak said he had continued to share a bed with Ms Lagwinowicz after starting the relationship with Miss Wells-Burr.
It is alleged Miss Wells-Burr's boyfriend, Rafal Nowak, 31, first smothered her to death in their home in Chard, Somerset, on 12 September.
BBC: Catherine Wells-Burr death: No evidence from murder duo
He described Mr Nowak, who has a wife and son in Poland, as "possessive" and said he would bombard Miss Wells-Burr with phone calls.
Anna Lagwinowicz and her uncle Tadevsz Dmytryszyn are accused of dumping the body of Catherine Wells-Burr, 23, in her Ford car before setting it alight.
BBC: Catherine Wells-Burr death: No evidence from murder duo
Prosecutor Richard Smith QC said Miss Wells-Burr met Mr Nowak, of Willow Way, Chard, at Numatic International - which has a factory in the town.
It has Burr-Brown 2 Channel low-noise Op Amp, ELNA Audio Grade Capacitor and a R-core linear power supply - doesn't mean that much too you?
Rafal Nowak, 31, told Bristol Crown Court he had been given a copy of the policy booklet months before the death of Catherine Wells-Burr in Somerset.
The jury has heard evidence from Philip Wells-Burr, who worked as a business analyst at the Numatic factory in Chard alongside his daughter and her partner.
Rafal Nowak, 31, was charged after the body of Catherine Wells-Burr, 23, from Chard in Somerset, was found next to the A358 near Ilminster in September.
He told the court how he and Miss Wells-Burr had spent their last evening together eating beef burgers at the house they shared in Willow Way, Chard.
Miss Wells-Burr, who graduated from Bath Spa University with a first-class degree, was discovered by fire crews in her red Ford Focus in a field in Ashill.
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