What is the ruling on the separation of a couple due to the wife discovering indecent messages on her husband's phone, and his refusal to address the matter, which led to the wife going to her family's home, and the husband ignoring her and her pregnancy?

This woman has opened a door for Satan by disagreeing with her husband. She must obey her husband by returning to the marital home; otherwise, she would be disobedient (nashiz) and sinful. However, her maintenance (nafaqa) does not cease due to pregnancy. The husband ought to have checked on his wife's condition, and the wife should have sought refuge in Allah from Satan's whisperings. One can protect themselves from the schemes of plotters by holding fast to Allah, remembering Him, being grateful to Him, and worshipping Him well.