missylea, this chap has some serious issues, you of course know this so don't go blaming yourself.
Whatever your part in this whole affair may be, his behaviour is unacceptable.
You have a rough path ahead, & it will not be easy to walk it alone.
You are not alone, as your 3 dc will be with you & you must summon every ounce of strength you can to move on.
Unless this chap gets help, you cannot afford to engage with him. This is harsh, but true.
In any event, you need to settle in your own mind that you & your dc will survive with or without him.
I would guess the reason that you are still hurting is because you are of a sensitive nature, which incidentally is a grand trait to possess.
On a practical front, are there any local groups that you could hook-up with? Having someone to talk things over with (unload) would I feel be of great assistance.
I don't know about abusive relationships & can only imagine what you are experiencing, but I do know what it's like to feel totally isolated & lonely.
Chin-up, there are people who have trodden these paths before & some are more than willing to lend a hand where they can.
It might not seem like it, but if this chap has any hope of returning to the human race, he has a far longer & harder path to tread than you.
Peruse the counselling & don't feel afraid to enquire of the relevant authorities for help (possible victim support?)
I do hope things improve quickly for you in the short term & that your inner hurt lessens.