A Muslim man from UK stab his wife for not allowing him to get remarried

A Muslim man from the UK stabs his wife to death for refusing him to not remarry. According to Islam a Muslim man can marry as many women as want in their life and there is no boundary in this but killing someone for not allowing a man to not get married again is such a heinous crime. Well the accused is found guilty in the UK court but the crime he has done is a story of almost every Muslim household. If a Muslim woman does not allow his husband to remarry he will either kill his wife or give her divorce. Because in Islam this is not a crime , in fact this is more of a ritual.