In a “devious and concerted” covert operation, Bowditch read her private emails and even posed as his wife on social media to send messages to his supposed love rival.
But the “affair” was a figment of his imagination, a court heard.
Bowditch, 37, and his veterinary nurse wife split up in March after seven years of marriage when she discovered he had been spying on her.
Gavin Bowditch fitted a tracking device to wife Helen’s car to catch her with her non-existent lover
She then made a statement only to retract it later, the court was told.
Bowditch, of Fiddington, Somerset, denied stalking and causing his wife serious alarm or distress.
The supply teacher, who worked at The Castle School in Taunton, Somerset, was found guilty at Taunton Magistrates Court.
District Judge David Taylor warned Bowditch he faces “immediate custody” when sentenced at a later date.
Bowditch was found guilty at Taunton Magistrates Court
“There is no doubt about it, he installed a tracking device in her car.
“He made clear it was to monitor her movements to see if she was having an affair.”
The tracker and the secret camera under the TV showed he intended “to monitor and track his wife,” the judge added.
Bowditch was able to read his wife’s email’s and Facebook messages after she gave him her old phone.
Police examined her car and found the tracker which had been fitted shortly before and had been active for 10 days.
Judge Taylor said: “It matters not she was unaware these things were happening, the fact she learned about it later on is relevant, when she did find out I’m quite satisfied it led to alarm and distress.
“I’m sure there was a course of conduct that can be described as improper, oppressive and calculated to produce alarm and distress.
James Mumford, defending, previously told a court, Bowditch agreed that his behaviour was “not acceptable and not justifiable” and said any normal person would think he was “a lunatic.”
Mrs Bowditch is now divorcing her husband. She is keeping her new address secret, insists the gates at work are closed and has stopped using Facebook.
She stressed she never felt in danger of “physical harm” and agreed she had given her husband a non-secure phone.
By John Twomey – The Daily Express – July 31, 2017