Dean Lowe murdered his girlfriend Kirby Noden, 32, in January 2017 and went on to dismember her body and dispose of it in a bin near their home in Marazion, Cornwall.
The 33-year-old killer lived with the evidence of the murder for months, telling family and friends that Ms Noden had left with another man.
The horror only emerged months later, when Lowe sent messages saying he had disposed of her body.
“Either I’m getting set up or I’ve murdered Kirby. I had a blackout, hazy memory and woke up with a body on the floor. I am scared so I just got rid,” he wrote to a cousin.
“I put the body in the bins down the road. I remember the binmen finding all the meat and didn’t know what it was. The carpet was lifted because of the body matter.”
Investigators at Lowe’s flat then discovered a scene of carnage, with blood spatters on the walls, a metal pole and rock used to batter Ms Noden to death and stains on the underside of a mattress that Lowe had continued to sleep on.
The killer also said he made a necklace of Ms Noden’s teeth.
Lowe was found guilty of murder on Thursday following a trial at Truro Crown Court.
Sentencing at Exeter Crown Court on Tuesday, Mrs Justice May said Lowe had consistently lied, showing the “opposite of remorse”.
She said: “You must have eaten, slept, watched TV and taken your drugs next to [Ms Noden’s corpse] for several days, with two bull terriers in the same room.
“You cut up what remained, wrapped some in the carpet and took the rest in rucksacks to the bins.
“The bin men collected them noticed nothing – in this bleak, desolate manner was Kirby’s life ended and her remains obliterated.”
She added that Ms Noden was besotted with Lowe and did whatever he asked, while her killer referred to her in degrading terms.
The pair had taken large amounts of drugs and lived “chaotic” lives, the court heard.
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In a statement, Ms Noden’s said: “Dean Lowe has taken away from us something totally precious, and although we welcome this verdict and sentence, it will never replace our loss.”
Mr Noden was sentenced to life, with a minimum term of 28 years in jail.