Mr Nowak, who lived with Miss Wells-Burr while still sleeping with his ex-girlfriend, Ms Lagwinowicz, wept during four days of evidence as he denied having played any part in her death.
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.
He said he later returned home with Miss Wells-Burr's parents where they found no trace of her.
Earlier during questioning, Mr Nowak said he had continued to share a bed with Ms Lagwinowicz after starting the relationship with Miss Wells-Burr.
The murder was the result of months of secret meetings and phone calls between Mr Nowak and Ms Lagwinowicz, with Miss Wells-Burr oblivious to her part in the so-called "love triangle", the court was told.
The three are accused of creating a fake trail of text messages with a "mystery man", implying Miss Wells-Burr was having an affair with an unidentified man who was responsible for her death.
Historians suggest that Alexander Hamilton was behind campaign fliers that hinted that his nemesis Aaron Burr was sleeping with his own daughter.
He told the court Mr Nowak had become upset when Miss Wells-Burr had a heated telephone conversation with her mother, something that prompted the factory worker to believe his partner was going to leave him.
Mr Nowak agreed with prosecutor Richard Smith QC that Miss Wells-Burr must have been dead before her body was moved from the house and told the jury it was likely that her body had been removed through the home's rear patio doors.
David Wayne brings a hectic pathos to the role of the psychopath at war with his own urges, and an iconic batch of character actors (including Howard Da Silva, Raymond Burr, Luther Adler, Norman Lloyd, Jim Backus, and Glenn Anders) incarnate with streetwise flair the officers of the law and the underworld posse trying to beat them to the killer.
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.
Mr. Burr said that the FBI told lawmakers it had been in contact with the Russians about the brothers "at least once" since 2011, but didn't elaborate on what information was learned.
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.
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