"some men are thoroughly bad-intentioned, that no amount of patience will make any difference. An alcoholic of this temperament may be quick to use this chapter as a club over your head. Don’t let him get away with it. If you are positive he is one of this type you may feel you had better leave. Is it right to let him ruin your life and the lives of your children?"
--From the Chapter To the Wives in the AA Big Book, First Edition
It sounds to me like your man might be one of the above. That is something none of us can control (including YOU ), and he'd only be able to change if he wanted to, and with a lot of help and hard work. The bit you CAN change, is whether you're around to be the target that he aims his vitriol towards. My goodness, if someone as poisonous as this offers to walk away of their own volition, I'd seize the day, kiss him goodbye and wish him good luck, and then change the locks and block him on my phone quick smart.
You have one life here on Earth. Don't you deserve it to be a happy, safe, and loved one?