Jealous alcoholic Carl Mills, 28, bombarded his partner with threatening texts and, convinced she was inside with another man, warned: "I will burn your house down."
Mills stood unemotional and apparently uninterested as the jury at Newport Crown Court delivered three unanimous guilty verdicts.
He then sat and listened to a family victim impact statement read out to the court by prosecutor Gregory Bull QC.
More top news
Police have expressed concern for a missing 13-year-old girl who was last seen on Saturday.
Fat and unfit police officers who fail fitness tests must lose weight or "we haven't got a job for them", Sir Bernard Hogan-Howe has said.
Jeremy Hunt has accused staffing agencies of "ripping off the NHS" as he announced new measures to clampdown on