I think, Calliope, that this is going to be a very big wakeup call for Mr H. I mean, it seems like he thinks he can do anything he wants to and then everyone (wife, mistress, children) is to respond accordingly. So he fires his lawyer. Okay, he thinks, now you don't need one either. This is going to be a very important lesson to him that you are your own person and he is not calling the shots for all the people in his life. Even if this works out for you in the long term, he has got to learn that.
He can get a lawyer, fire a lawyer, have an affair, break off the affair...whatever, that's his life. And that's the only one he gets to be in control of. I think it's a good lesson for you to learn too!! Because let's say the R with OW does blow up...if it does he's likely to say ok, I want to come home and play house again, and then of course, you're part of the script is to say okay. So use this time to continue growing like you are and becoming emotionally independent, because that will make you strong for any eventuality!