David Clark is accused of murdering his wife, Melanie, after they had taken part in drinking games, before he called 999 and confessed.
The 49-year-old told the operator "she f***ing did my head in" after attacking her at their Worcestershire home just before midnight on New Year's Eve, Birmingham Crown Court heard today.
The jury was told the couple had been married for 10 years but had a turbulent relationship.
They had argued about a lesbian affair the 44-year-old South African-born woman had with one of their friends' daughters.
Mrs Clark, who had four children from a previous relationship, was pronounced dead 12 minutes into the New Year.
Just minutes later her two sons Sheldon, 22, and Slade, 19, returned from a party to see their stepdad arrested in blood-soaked pyjamas, the court was told.
In the hours before her death the jury heard the pair downed three bottles of Prosecco between them as they celebrated with friends.
The court heard Clark tried to kill himself with gas at their three-bed £200,000 home before police arrived and even begged officers to kill him.
Prosecutor Benjamin Aina QC said: "Melanie Clark had told her husband she wanted him to leave their home.
"He couldn't take the rejection and killed his wife.
"They had been married for 10 years. They had no children together, but she was the mother of two boys and two girls from previous relationships.
"There was a bit of turbulence in the relationship between the defendant and his wife."
After a brief separation, the court heard Clark moved back into the family home in February last year but they slept in separate bedrooms.
Jurors heard by November Mrs Clark told friends she was "not happy".
Mr Aina said: "The master bedroom of the house is the bedroom where Melanie slept. This is where the body was found.
"There was a knife that had been found near the body.
"It was about 10 minutes before midnight that David Clark telephoned the emergency services.
"He says to emergency operator 'I'm sorry, I've killed my wife. My wife started being s*** again.
"I'm totally in love with my wife. She f***ing killed me and I had to stop her. I can't believe I f***ing did it.
"I'm going to do myself in. I love my wife so much.
"She f***ing did my head in. I'm f***ing devastated. I don't know why I did it'.
"When asked 'what did you stab her with?' he replied 'I think a knife'."
"During a later police interview, it came out that a friend of Melanie and David had a daughter – and she had had a lesbian encounter with Melanie. She had told David about this before.
"She brought it up again on the evening of the incident and he couldn't remember what happened next.
"Even before they were married, she had made comments that he had a 'small d***'. He had a complex about it.
"He only realised he had blood on his hands when he got to the police station.
"She had not been violent to him on the night she was killed.
"He kept a dagger-shaped cook's knife in his room. Blood on the knife was later found to be that of Melanie."
Clark denies murder. The trial continues.
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