Just got to get this off my chest

O.k. So my soon to be ex (STBX) decides to use my youngest as a pawn. A few weeks ago, it was mutually agreed upon that since he is going out 4-5 nights a week to drink that I could have Wednesday and Saturday nights to myself to do as I please. If I want to go out and be with friends, study for my cert, whatever.
Well, Christmas Eve was my night to go out and he goes out instead. Just doesn't come home from work. So I text him and ask him where he's at and thanks for ruining my plans. He comes home later, after midnight, and after a "discussion", tells me that we are through...again. Second time. Both initiated by him. He tells me he is filing for divorce. I am doing it anyway. I thought I would be able to by the end of December, but due to financial circumstances not able to. But now it looks like I will have to get an attorney anyway.
Oh and he also took the Saturday before.
So Saturday comes and I am going to head to Barnes and Noble to study. That way if I need reference books they are right there. I over hear him tell my littlest one, whom he spends no time with anyway, that he is going to bed. Where he has been all day basically. So I ask him if he is going to watch Rhett while I go out. He says no. That it is my fault and I should have thought about it before I called the marriage quits. HELLO!!!! He is the one who called it quits twice. I just told him that I was holding him to it this time to pay for the divorce and file. I told him that I am tired of him changing his mind all the time whether he wants us or not. I told him that since he didn't do any of the things that he told me he planned to do that I did not see him changing anything. I told him that since he called it quits that it was over and done with, no going back. So now its all my fault.
Something I expected him to rationalize anyway. That's the way he operates. Its always someone else's fault even though he pushes them to it.
So I ask him again. If I go out that he will not watch Rhett. I say that he is his father and he needs to have responsibility towards him as well. Again he repeats that it is my fault and I should of thought of that. I told him that he is not making any sense. I ask the boys if they heard what he had stated. They both heard.
He says that he will not watch his own son because something has gone wrong between the two of us. I even told him not to use Rhett as an excuse. I told him that it is wrong to pull Rhett into the middle of this since it is not about him.
What a man right? Can't even call him a man.
I know know what type of person I really married. I thought it was bad with him emotionally abandoning us. But to use a three year old this way? This makes me so flippin angry. I am writing this to work off steam as the physical labour isn't. Too bad my punching bag broke, or I'd be out there working out. I really need to get another one.
And he thinks acting this way is going to make me come back. Words cannot express the anger I feel.
I know I need to concentrate on getting out of here. But this is my house, this is the boy's home. I don't want them to feel like I do about not having anything permanent. I know once I get my credit back...which he ruined...I will be able to get another house. But still.