A North Texas music teacher has been arrested for sexually assaulting a 15-year-old boy he says he met on the gay dating app Grindr, police say.

Roger Kessler, 43, who has taught music at RISD Academy in Richardson for 14 years, was arrested Thursday by McKinney police responding to a report of a suspected burglary in progress at the teen’s home. When police arrived, they found the teen’s mother holding Kessler.

Kessler told police that he and the boy met four times, had oral and anal sex and used protection every time except once. He said he has HIV but did not tell the boy, according to a probable cause affidavit obtained by The Dallas Morning News.

Kessler said he knew the boy was 15 years old but didn’t know his name, police said.

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