I'm not sure what this is. A rant or asking for advice or just a handhold but here goes...
I am in the process of divorcing my alcoholic, abusive H. We have a young DS. We are still in the same house, as he refuses to move out until I've bought him out of the house.
He is currently on best behaviour with regard to the alcohol side of things. Best behaviour being, maybe 3-4 beers a day most of the time, rather than 15-20 as it was previously (he still drinks a lot more sometimes at weekends/social events/when he feels like it). He claims he is "no longer an alcoholic". (Obviously bullshit, but the fact is, this current level of driving wouldn't be considered a danger in a social services definition, and he drinks after DS is in bed so he doesn't witness him drinking usually).
He has always been greedy and selfish. But now he's hostile and ruthless with it. We have been having divorce mediation (at his insistance because he wasn't going to put up with me just telling him what to do apparently). He took the whole of our last session ranting on, justifying stupid things and trying to discredit everything I said etc. The mediator had the measure of him to be fair! She largely ignored or dismantled anything irrelevant, and therefore spent more time arguing with him that I did!
On the plus side he agreed he would not drink at all when he has our DS overnight alone - this was his own limit set when I asked for reassurances around drinking while with DS. I will almost certainly need to refer back to that at some point, if (when?) I have to step in because the drinking has escalated again. I suspect this could happen pretty quickly once we have resolved things. But I've had to agree more contact than I think is in DS interests in the meantime - average 2 overnights per week plus another evening for tea after school.
I feel like I'm letting DS down. I think that's the worst of this.
He genuinely believes I owe him the moon on a stick and then some when it comes to the finances despite the fact that I put everything in financially and he has always put in as little as he can possibly get away with. The greed is just so ugly.
I'm trying so hard not to engage with his vile attitude and behaviour. But in doing so, I feel like he's just getting away with it? Just listening to him bang on in mediation knowing that joining in wouldn't achieve anything made me feel like I was just taking it. It wasn't achieving anything for him in a practical sense either, it was meaningless projection.
But the way it's left me feeling is weak and broken and I'm struggling to keep a clear head. I think I just need a handhold and some encouragement to keep moving on 
Thank you for reading, sorry it's so long! Think I just needed to get it all out..