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A Qatar man on trial for the stabbing death of his boyfriend's long-term partner has told a Perth jury he feared for his own life and wrestled with the alleged victim over a knife.

Mohammed Ahmed Almansouri, 39, is fighting a charge in the Supreme Court that he murdered Texan man Kenneth "Kenny" Horack, 48, who was his boyfriend Ben Campbell's partner of 17 years.

Mr Horack had only been in Perth for nine days to visit Mr Campbell, who had moved from Qatar to WA for work.

Mr Horack who was stabbed 14 times, died in Mr Campbell's rented Subiaco unit on August 4 last year. Mr Almansouri and Mr Campbell had been in a relationship for two years.

Prosecutors claims Mr Almansouri murdered Mr Horack in a jealous rage over the love triangle and intended to kill him.

Taking the stand in his own defence today, Mr Almansouri, whose gave his evidence via an Arabic interpreter, said Mr Horack was verbally abusive and provocative towards him and made him feel "unworthy".

Mr Almansouri said on the night of the alleged murder he had arrived home after drinking beer at the Swan River and saw Mr Horack in the lounge room with another man, who he did not know.

He said Mr Horack followed him to his bedroom, yelling and pushed him to the ground.

The accused man said he grabbed a folding knife from his bedroom and went to the lounge room to "scare" Mr Horack to take down a photograph he had displayed of Mr Campbell and himself.

"I told him to to put my photo back (with Mr Campbell) and take his photo," he said.

He said Mr Horack pushed him again and the knife, which did not have the blade exposed at this point, fell out of his hands, causing Mr Horack to grab the weapon and stab him in the buttocks as he tried to run away.

Mr Almansouri said he struck Mr Horack's hand three times with a pick axe, causing him to drop the knife and the pair wrestled, with Mr Horack on top of him. "I was thinking he would take the knife, try to stab me and kill me," he said.

Mr Almansouri accepted Mr Horack's 14 stab wounds were caused during the wrestle but cannot remember how they were inflicted. He said he could not remember where the third man was during their struggle.

The accused man said after he noticed blood he called Mr Campbell, who was at a work dinner, pleading with him to come home. Mr Campbell testified Mr Almansouri told him over the phone "I killed Kenny", but the accused, who told the court he was "terrified" at this point, said he could not remember saying anything except come home.

Mr Almansouri said he never wanted Mr Horack and Mr Campbell to break up and he had wanted to return to Qatar before Mr Horack arrived in Perth.

The trial continues.