A husband's wife has left him and is living with her boyfriend, while also suing him for maintenance for herself and their child. The advice suggests the husband may be able to file for divorce on the grounds of adultery, but requires proof. He can also contest the maintenance claim by arguing his wife voluntarily abandoned the matrimonial home for an adulterous life, though he will likely still need to pay child maintenance. Consulting a local solicitor is strongly recommended for tailored advice and to navigate the legal proceedings.