Accused wife killer Gerard Baden-Clay has denied he was scratched by his wife the night before she vanished, telling his trial they were mending their marriage.

Accused murderer Gerard Baden-Clay admitted he deceived his wife for years but told a court they were mending their marriage, and denied struggling with her the night before she disappeared.

On the day Allison Baden-Clay would have turned 46, her husband told his murder trial that while he was unfaithful to her, he never intended to leave her.

The 43-year-old denied before a packed court room that Allison scratched him on the face on the night of April 19, 2012.

Baden-Clay reported her missing the following day, and told police red marks on his cheek were shaving cuts from a blunt razor.

Crown prosecutor Todd Fuller put to Baden-Clay that the injury occurred when his wife scratched his face while she was struggling with him.

“No. That’s completely false,” Baden-Clay replied.

The Brisbane Supreme Court has previously heard the father-of-three’s phone was placed on charge at 1.48am on April 20, 2012.

Under cross examination Baden-Clay said he left his phone with Allison as usual the previous night.

“I suggest to you that you in fact did have your phone,” Mr Fuller said.

“You can suggest away, I did not,” he replied.

The accused denied knowing the location of the Kholo Creek Bridge, where his wife’s body was found on April 30, 2012, 10 days after he reported her missing.

He said he was following the advice of his father, a former insurance agent, when he phoned an insurance company on May 1, 2012, to ask how to claim on his wife’s life insurance.

Baden-Clay agreed with Mr Fuller that he’d deceived his wife for years through more than one affair but said he never loved mistress Toni McHugh, with whom he began a relationship in 2008.

April 2012 emails to her declaring “I love you” and “I will be separated by 1 July”, were attempts to “placate” his former employee, who had fallen in love with him.

He said he told Ms McHugh he loved her “because I was concerned about her and because I wanted to maintain the sexual relationship”.

Baden-Clay agreed with Mr Fuller he was willing to say “whatever needed to be said” to get himself out of some situations.

“You had the best of both worlds – you had a home with the children and you were able to be the family man and you were still able to play the lover,” Mr Fuller said.

“Yes,” Baden-Clay acknowledged.

The accused denied he was under financial or relationship pressure when his wife vanished, saying things were getting better.

“Allison and I were working together very well on both our relationship and the business, and financially the business was turning around and we were moving forwards,” he said.

Baden-Clay’s cross-examination is expected to continue on Wednesday.