Calm down everybody. Horrible as it is, this now presents a proper opportunity for legal intervention if he can stomach it.
He needs to report the assault, even if he subsequently chooses not to press charges.
Having it on record may be a powerful asset further down the road.
I am sorry to hear it is getting so out of hand and hurtful to you both, but it is just a blip on the way to your objective.
Be strong and make sure it goes on record...