Well, it really depends on the person and situation as everyone has different opinions and belief when it comes to love and relationship.
In my opinion, there's really no practical step but to either go to court and sue the other person or leave him/her because an abusive relationship will go nowhere as time goes by.
It could even lead to death especially to women who gets beaten up by their husband if it's a physical abuse relationship.
When it comes to verbal abuse, that is something both of you can still talk about or get a psychiatrist/psychologist whatever to help the other person from verbally abusing the other partner.