A musician who supplied his girlfriend with a lethal dose of drugs and filmed her as she lay dying at a music festival has been jailed for eight and a half years.

Ceon Broughton, 30, gave Louella Fletcher-Michie, 24, the party drug 2C-P at Bestival in Dorset in September 2017. She died after suffering a fatal reaction.

Jurors at Winchester crown court were shown footage in which Fletcher-Michie repeatedly shouts at Broughton to phone her mother but he dismisses her, telling her to “put your phone away”. Prosecutor William Mousley QC claimed Broughton did not get help because he had been handed a suspended jail term one month previously and feared the consequences.

Jurors found Broughton guilty of manslaughter and supplying 2C-P on Thursday. Sentencing Broughton on Friday, Mr Justice Goose told him: “You were only concerned for yourself. You didn’t want to be arrested, you were more in fear of that than in getting help.”

John Michie outside Winchester crown court after Ceon Broughton was found guilty. Photograph: Andrew Matthews/PA

In impact statements read in court, Fletcher-Michie’s father, mother, Carol, and sister, Daisy, told of the devastating impact wrought by her death.

Her father, the Holby City actor John Michie, told the court: “I wake up every morning to face life starting again without Louella, our daughter, our sister, our friend, our family now broken.

“It makes no sense. Our beautiful Louella should still be with us on any measure of humanity. No more yoga with my daughter, no more running round the outside of the Arsenal stadium with my daughter, no more family fun with my daughter, her life cut cruelly short.”

Her mother, a former singer with Hot Gossip, said: “Having to learn to live with this for the rest of our lives, it’s thrown everything I believe in life into question.”

She added of the defendant: “We do not think Ceon is evil. He was stupid, massively selfish and he lied.”

Fletcher-Michie’s sister said she had been diagnosed as having post-traumatic stress disorder and had suffered panic attacks following her sibling’s death.

“Our lives have been torn apart by the actions of someone who was supposed to love Louella, the most-loved person I have known,” she said.

Fletcher-Michie’s mother eventually contacted Broughton at 6.48pm on the night of her death and heard her daughter “screeching” before she rushed with her husband to the festival site in a bid to find her. During the trial, the court heard an expert view that the yoga and dance teacher would have had a 90% chance of survival if she had received medical help. The body of Fletcher-Michie was eventually found in woodland.

Broughton, a grime MC, who performs under the stage name CEONRPG and has recorded music with Skepta, had previously pleaded guilty to two other charges of supplying 2C-P to Fletcher-Michie at Glastonbury festival earlier in 2017. He was also in breach of a suspended prison sentence for two charges of possessing a lock knife and a Stanley knife blade.

Broughton, from Enfield, north London, showed no emotion as the verdicts were announced on Thursday.

On Friday, Stephen Kamlish QC read a statement to the court from his client, saying: “Sorry I didn’t do more to save Louella, sorry for the suffering I caused to everyone who loved Louella. I want to make things right.”