It was bound to happen WTBH, and I think beyond your Codie tendencies, it's natural to feel compassion for him as you watch the depths he has chosen to sink to simply because he will always be the father of your children.
Can I also just say, GOOD. Good, great, awesome, I'm-so-freaking-glad that FINALLY finally FINALLY someone (other than you) is taking this seriously for your girls' sake. It sucks that it comes down to needing others to corroborate the abuses that you endured & are trying to protect your kids from, but I'm so thankful for you that FINALLY someone else is helping your case & not his.
I think you're smart to brace yourself, I agree it is likely to get a lot worse & he is likely to get even more unpredictable as this progresses.