Warning: This story contains descriptions some readers may find distressing, including references to suicide.
Christopher Trybus, of Swindon, Wiltshire, stood trial accused of killing of Tarryn Baird, who died aged 34 in November 2017.
The 44-year-old defendant also faced charges at Winchester Crown Court of controlling and coercive behaviour and two charges of rape.
He has been cleared on all charges.
It was the first case of its kind in England and Wales.
Mr Trybus, who denied the offences, claimed his wife made the allegations as a result of mental health issues, including a probable diagnosis of post-traumatic stress disorder (PTSD) after she witnessed violent car-jackings in South Africa, where the couple grew up.
The defendant, who runs an IT business, also said he was out of the country when some of the incidents were alleged to have taken place.
Anyone feeling emotionally distressed or suicidal can call Samaritans for help on 116 123 or visit samaritans.org in the UK. In the US, call the Samaritans branch in your area or 1 (800) 273-TALK.
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