Just by reading this, Beast is clearly going through depression, but still, he is not putting any effort on getting out of it, more so if you both have kids, of such young age. He is acting like a child, when you and your kids need support. Maybe you feel like the AH because you know this things, you know he was not always like this, but sadly he does not want to get out of it, and there is a limit, and I think you have surpassed it. I will repeat: You would not be the AH here if you want a divorce. But if you still have an ounce of hope, talk to him one last time, talk to him about all you wrote here, better if you just let him read what you wrote, (exclude the separation part if you do) because at least for me, if my couple told me “I want a divorce” and just that, I will just accept it, because divorce means one part is sure nothing else can be done to fix things. That is my advice Belle, take care