It happened already,let it go ahead as whereever it goes. Maybe you are lucky that 485 is processed without any trouble. Maybe you need a face-to-face interview with IO, maybe you need to provide more information. Even if you withdraw the case, the criminal record is still there, and it will still affect your new application. So I do not suggest withdrawing at this moment.
In addition, if he always uses his fist, and you can not suffer it any more, calling 911 is a right choice. After this, you may need to think more about your future life. If he just did this very occasionally for some understandable reason, you may shouldn't bother police. Some conflict in a family needs to be solved only by hu*****and and wife.