Before the fatal stabbing, Rook had told George that they should separate and he should move out of their home, which she owned.
But she had planned to give her partner £50,000 to find a new home, and harboured hopes that they would continue to holiday together in the future, the court was told.
George, who had been drinking red wine on the night of the murder, had learned that he was not legally entitled to any share of the property, and he started an argument with Rook.
“In the course of that argument he punched her, he then tried to strangle her, and then he went to the kitchen to get a knife, he came back with the knife and he stabbed her to death,” said Jones.
“He lost his temper, and in his rage he murdered Annabel.”
The trial heard he was the victim of violent abuse at the hands of his mother when he was a child, leading to him being taken into care.
His barrister, Mathew Sherratt KC, told the court: “He understands this is a terrible thing he has done.”
George pleaded guilty before the trial to manslaughter and arson being reckless as to whether life was endangered. The jury convicted him unanimously of murder.
