nancydrew - I remember all too well I had one phonecall from my ex where he seemed to be expressing doubt that he had done the right thing going off with this OW. One call. Out of the many others. And I felt as though a corner had been turned, that was it, he was coming back, it was all over with her - for the weekend while I was away. Then on the MOnday I phoned him to let him know I was back in town and he was out shopping with her - it was like a bucket of ice being thrown over me.
You clutch at straws, you read far too much into any little thing at this stage - you make excuses, you blame anyone other than the person who is most at fault at this stage - but this stage comes to an end. And it does it in variable time, depending on lots of factors.
For example, my Mum insisted I should go cold turkey and not see the ex - he had to come to the house every weekend to do stuff I refused to do - and for the first 3m, I was there when he came, to try and get sense of what had happened, and to really get to grips with the situation. Plus, yes, part of me wanted to see him. But after those 3m, I knew the end had come and I chose not to see him ever again. Unluckily for SoLost, she doesn't have that luxury because of the DC - but it happens. You realise. And people can tell you until they're blue in the face how you OUGHT to be going about it, and it will all get taken on board, but IME you still won't do it until you're ready.
SoLost - I do think you need to stop answering his calls at all, and definitely have no truck with the OW - either in telling your H that she has contacted you, or in replying. If necessary, get her number blocked if you can.
And you are going to have to have a serious talk with your H about how things are going to progress with regards to the house, maintenance, divorce etc. He is cruising at the moment, he doesn't have any hard thinking to do - make him think about it.