Murder accused Adrian Muir’s partner of 32 years told a court she was devastated when he left her for the woman he is alleged to have killed.
Susan Drake had been with Muir since 1980 but he left her last year after meeting Pamela Jackson on an online dating website.
Prosecutors claim Muir murdered 55-year-old grandmother Pamela at her home in Chester-le-Street, County Durham, then buried her body 120 miles away on moorland near Halifax.
Giving evidence from behind screens, Ms Drake said Muir loved going to the moors near their former home in Halifax, where he would go fell running and cycling.
Ms Drake said he was her “soulmate” but she didn’t like him when he lost his temper.
She told Newcastle Crown Court she had “learnt a long time ago not to make him angry” but said he was very protective and she always felt safe with him.
She told the court she knew Muir and Pamela were not right for each other and claimed Pamela told her on Facebook she was a doctor, a clairvoyant and a millionaire.
She also said Muir had texted her, saying he had made a mistake by leaving her and begged her to take him back, but she told him there was no way back.
Ms Drake told jurors: “He told me I was his soulmate and he had made a mistake.”
Asked how she felt when Muir left her after meeting Pamela online, she said: “He broke my heart. It’s been terrible, he was my soulmate.”
Ms Drake told police she always felt safe with Muir during their long relationship.
She told the court: “I learnt a long time ago not to make him angry.
“I didn’t like him when he lost his temper.”
Ms Drake said she had communicated with Pamela on Facebook. She said Pamela made various claims about herself which she didn’t believe.
She said: “I knew she was no good for him.”
Muir is alleged to have murdered Pamela at her home on The Crescent, Chester-le-Street, in March this year.
She was reported missing by her sons and her body was not found for almost two months.
Pamela had been buried on bleak moorland along with a plastic bag containing a bunch of flowers.
Prosecutors say Muir then left suicide note voicemails on his own phone allegedly confessing to killing Pamela.
But he denies responsibilty, claiming she had gone away after Botox injections went wrong.
Muir, 50, a dry stone waller and engineer, of Halifax, denies murder.
The trial continues