“Meredith was the first victim of this hideous (crime) but we are other victims,” Raffaele Sollecito told ITV’s Daybreak programme on Monday.
Mr Sollecito, 29, a computer studies graduate, and Miss Knox, who has resumed her writing studies in Seattle, were convicted but then acquitted of the murder of Miss Kercher in Perugia in November 2007.
However, Italy’s highest court overturned those acquittals in March, faulting the judgment of the lower appeals court, and ordered a retrial in Florence which is expected to start later this year or early in 2014.
Asked whether he felt uncomfortable making money out of the saga, having written a book, he said he had no choice because he needed the funds.
He had been hoping to settle in the Italian-speaking part of Switzerland but recently had his residence permit revoked.
"I have to make money in order to defend myself. I cannot get a real job and, even if I had a real job, there is not enough money there," he told the programme, speaking in English.
Mr Sollecito discussed the prospect of him and Miss Knox having to face the retrial for a crime that they insist they did not commit.
"It is not about facing the nightmare again together, because we are no longer together as a couple. We are friends. All of these kinds of unfair things are happening in Italy. I am Italian, she is American, that is the difference, she has a more normal life at the moment."
Miss Kercher, 21, from Coulsdon, Surrey, was studying for a year at Perugia’s University for Foreigners when she was found murdered in the house she shared with Miss Knox and two young Italian women.
Mr Sollecito said he felt “very bad” for Miss Kercher’s family. “She didn’t deserve anything like that, but I’m not responsible.”
He said he wanted Italian prosecutors to read his book to find out the facts about the case. The pair was found guilty in December 2009 of murdering the Leeds University student, with Miss Knox sentenced to 26 years in prison and Mr Sollecito 25.
But after an 11-month appeal in a Perugia court, both convictions were thrown out in Oct 2011.
The only person behind bars for the crime is Rudy Guede, a small-time drug dealer who was born in Ivory Coast but brought up in Perugia.
He is serving a 16-year prison sentence after being tried separately and convicted of murder and sexual assault.
Mr Sollecito and Miss Knox had a reunion recently in New York.
Defending their meeting, Mr Sollecito’s father said the former lovers had "shared a nightmare which is still not finished" so it was only natural that they would take the opportunity to see each other.
Francesco Sollecito, a doctor from Puglia, said his son’s life had been ruined by the accusations levelled against him, saying that no company is likely to want to employ him when he finishes his software engineering degree at Verona University.
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