Just go to legal on post first. They may help you take some right steps before you start the divorce. Just remember social media and electronic messages can and will be used against you so don't react when he starts in. Just save his electronic messages and keep a journal of all the abuse he will commit. Be prepared for him to unleash on you about how bad a wife, mother, etc. you are and have been. 😒 Start personal counseling so his words won't have the desired effect and you can bounce questions off the counselor about if what he says has any merit or "would a healthy man say..."
You can go on post and always there is low rate divorce of post by B street