Intimate text messages between former Northern Territory police boss John McRoberts and a major fraud target have been read out in court, as prosecutors made their final attempt to persuade the jury.

Mr McRoberts is five weeks into his trial for allegedly attempting to pervert the course of justice.

The crown claims he tried to deflect and frustrate the 2014 travel agent fraud investigation that led to the arrest of his lover, Xana Kamitsis, who was jailed in 2015.

The crown claims he tried to deflect and frustrate the 2014 travel agent fraud investigation that led to the arrest of his lover, Xana Kamitsis, who was jailed in 2015. Picture: 9NEWS (9NEWS)

Mr McRoberts is five weeks into his trial for allegedly attempting to pervert the course of justice. Picture: 9NEWS (9NEWS)

In his closing address, Prosecutor Michael McHugh SC read through some of the messages found on her phone, which he said "alluded to their ongoing intimacy" throughout 2014.

"There were tiffs, lovers' quarrels," he told the jury.

On April 4, Mr McRoberts wrote, “Come over!”

“I so wish I could.. I don’t have a car !! I so want to make love to you ...” Kamitsis replied.

In his closing address, Prosecutor Michael McHugh SC read through some of the messages found on her phone, which he said "alluded to their ongoing intimacy" throughout 2014. Picture: 9NEWS (9NEWS)

A month later, the Commissioner learnt Kamitsis was the focus of a major fraud investigation.

Several witnesses said Mr McRoberts declared he was friends with her – a “lie of omission”, according to the crown.

“We should have woken up together at the Hyatt, your birthday is so important to me,” Kamitsis said on October 16, a month before her arrest.

Several witnesses said Mr McRoberts declared he was friends with her – a “lie of omission”, according to the crown. Picture: 9NEWS (9NEWS)

McRoberts told her to “use Viber” instead of iMessage, because it was a “safer way to communicate”.

The jury heard these exchanges went straight to his motive.

Mr McHugh said the Commissioner knew investigators would likely seize Kamitsis’ phone if they raided her business, and he didn’t want them finding out he’d “inappropriately” shared police information with her.

Mr McRoberts’ lawyer Tony Elliott argued his client’s conflict of interest was exposed the moment he declared his friendship.

Mr McHugh said the Commissioner knew investigators would likely seize Kamitsis’ phone if they raided her business, and he didn’t want them finding out he’d “inappropriately” shared police information with her. Picture: 9NEWS (9NEWS)

“Everybody lies about sex, even a former president of the United States of America,” he said.