Michael Quinn is standing trial for the murder of his 25-year-old girlfriend Cherie Vize, who was stabbed to death on the front lawn of his Wollongong family home.
His defence team has told the judge-only trial he was trying to commit suicide, and Ms Vize was fatally injured as she tried to stop him.
Quinn, 27, gave evidence to the Supreme Court from a wheelchair, after becoming a quadriplegic from self-inflicted knife wounds during the July 2013 incident.
He denied previous evidence from Ms Vize’s mother and close friends that he was “possessive” of the young art student.
“I never tried to stop her doing what she wanted to do, I only ever tried to facilitate it,” Quinn told the court.
He also denied Ms Vize ever told him he was suffocating her in their relationship, but said he regularly rang her 10 or 20 times a day.
He said he suffered from severe obsessive compulsive behaviours and the calls were “part of my morning and nightly rituals where I had to ring her”.
Less than two weeks before the alleged murder, Ms Vize told Quinn she was seeing another man.
Quinn agreed with the crown that ringing Ms Vize more than 40 times a day in the fortnight after the break-up could be seen as “obsessive”.
Crown prosecutor Marg Hobart SC asked Quinn: “You understand that 41 attempts to contact anybody in a 12-hour period is a lot?”
He replied: “I do … to be objective it would probably be seen as obsessive.”
He told Justice Robert Beech-Jones there was “no argument” and “it was such a relief after all this time that I were [sic] able to break from a truly dysfunctional relationship, and she had the opportunity to go and spend some time with another person”.
Ms Vize’s friends have previously told the court she was the one who ended the relationship.