A convicted sex offender living in the Bangor area is in jail after local police arrested him twice in three days. 41-year-old Joseph Webber was first picked up last Thursday for allegedly slapping his pregnant girlfriend at a hotel in Brewer.He was charged with domestic assault and violating bail conditions. Then three days later, on Sunday, Bangor police picked up Webber. He was staying at the Acadia Recovery Community – a substance abuse center – when he reportedly told a woman there he’d set her sleeping bag on fire, with her in it.Webber was charged with criminal threatening and failing to report to the Maine Sex Offender Registry that he’d moved from Mariaville to the Bangor area. He’s in the Penobscot County Jail on $250 cash bail.