A jilted lover set up a pornographic website featuring naked pictures of his ex-girlfriend in a hate campaign launched after she dumped him.
Motor racing promoter Alan Williamson advertised the website address on the livery of his racing cars as he travelled the world to race events.
He made numerous phone calls to his ex-girlfriend and sent up to 60 text messages per night to her mobile phone.
The 42-year-old also made insulting remarks about her to business associates, and claimed she was a prostitute.
Williamson's actions drove his former lover to consider suicide, Leicester Magistrates' Court was told.
Prosecutor Mark Williams told the court: "This is one of the worst cases of harassment I have ever encountered. "There is not a single shred of credible evidence to support any of the claims. I cannot emphasise enough the gross impact this has had on her - she became a social pariah and, at one point, considered taking her own life."
Williamson, who admitted five counts of harassment, did not go to prison because magistrates heard he was suffering from a severe mental illness. Instead he was ordered to pay £300,000 court costs and pay £5,000 to his former lover.
The court was told Williamson, formerly of Great Glen, and his ex-girlfriend ended their relationship in December 2004, after he refused to get psychiatric counselling.
Mr Williams said trouble began "immediately". He said: "Williamson travelled all over the world, making insulting comments about the complainant at premises such as garages and hotels where she was known."
In February he set up a website, which included a picture of them "in a very passionate and intimate position".
Mr Williams said: "When the police enabled the site to be blocked, he set it up again from a base in the USA."
Representing Williamson, Imogen Cox said that when she first met him she had concerns about his mental health. He was discovered to be suffering from bi-polar disorder and believed that everything he was doing was justified.
Williamson, who now lives in West Yorkshire, is now on medication for his mental illness. He was given a three-year conditional discharge and a restraining order not to contact his ex-girlfriend or anyone else involved.
thisisleicestershire.co.uk
