A jury at Newport Crown Court has retired to consider its verdict in the murder trial of Carl Mills.
He's accused of killing three generations of the same family by setting fire to their house in Cwmbran.
His girlfriend Kayleigh Buckley, her mother Kim, and baby daughter Kimberley, all died in the blaze last September.
Carl Mills denies three charges of murder.
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It was a stupid moment of madness that went terribly wrong, said the victim.