A judge ordered a city man held without bail Monday after police said the man strangled and then held a knife to his girlfriend’s throat after he found she had sent nude photographs to another man.”(The defendant) then grabbed the kitchen knife and pointed it at her throat, stating, ?if you call the police I’ll (expletive) kill you,'” Lynn Police Officer Richard Connick said.Matthew Bishop, 25, of 239 Boston St. #3, was arrested and charged with assault-and-battery; assault with a dangerous weapon; witness intimidation; and assault to murder; at 6:54 a.m. Sunday.He was arraigned on the charges Monday in Lynn District Court. He told police he denied the charges.Police met with a woman early Sunday who said her boyfriend had held a knife to her throat. The alleged victim told police she awoke at Bishop’s home to find him on top of her and strangling her, according to the report.The alleged victim told officers she pushed Bishop off and he grabbed a kitchen/steak knife and pointed it at her throat, according to the report. Officers reported the alleged victim said she fled the home with her child.The alleged victim told officers Bishop had “put his hands on her” before, according to the report. But she said she never called officers before now because she wants Bishop to get help for mental illness and drug use, according to police.Police noted they could not see any markings on the alleged victim and she could not identify which of “several kitchen knives” in the sink was used in the alleged attack. The alleged victim told officers she would drop the charges if they arrested Bishop, according to the report.Bishop told officers he returned from drinking at 4:30 a.m. and looked in his girlfriend’s phone to find “she had been talking to and sending nude photographs to another man,” police reported.”He stated that they argued over this and he punched a hole in the wall but he denied ever touching (the alleged victim),” Connick reported.A prosecutor requested that Bishop be held without bail pending a dangerousness hearing. Judge Mary McCabe ordered Bishop held without bail and scheduled him to return to court July 9.