Regardless of the espoused sacred nature of a marriage / relationship, where there is abuse there is no relationship. The dynamics are so dramatically skewed it is not an equal partnership. Nor is it a healthy one.
Although others often mean well when sharing their thoughts on lives other than their own, only those living in a situation can truly understand that situation.
It is perfectly okay to leave a domestically violent relationship. It is perfectly okay to prioritise your safety and/or that of the children and it is perfectly okay to seek help in achieving this.