First of all, I think that you need to be honest with yourself. If he did abuse you and the reason you are doing this is because he is pressuring you to...I would just say that you should let the law take care of it, and be comforted in knowing that he will not hurt you again. However, if he really didn't do anything wrong, I can tell you how to get him off of the charge. First of all, have him go to an anger management class (It looks good to a judge). Then hire an attorney and when he goes for his court date, be sure to go with him and walk into the room with your arm linked with his...it will help him out, trust me.
I'm going for the bar in a couple of months.