Domestic violence is never ok in a marriage.  You already know this, and you know what it is doing to you. I know you have searched your heart to find out what you are doing to cause this.  Did you solve it? 

What is causing this to happen? I hear your heart crying out this question.

Sometimes it's drug related..... is he on drugs?

 Alcohol can also  trigger it to start happening .... is there alcohol in your life? And what about his? Once done, this becomes a habit and a form of reaction.

Is it the result of childhood trauma?  Was he physically abused as a child and so has continued the damaging form of abuse in his adulthood? 

Is it  the result of control issues?  He is angry and wants to control the situation so the only way he knows  how to is with violence.

Still others use it as a way of reacting to anger.  It's a sick  form of release.  Is this it? 

There are others, but these are the usual violence triggers.  Is this happening to you?  Don't' wait... why wait?  Wait until what?  Wait until it happens again?  Go talk to someone today! Start changing your life right now!