Protect your assets. You did good in forwarding his bills to him.
You could send a message to the OW not necessarily to save your M but to speed him along faster to hit rock bottom. He's pretty much taken no responsibility for his own actions, preferring to blame everything on you.
Take care of yourself and your baby. If he tries to get into it as to how YOU are controlling, etc. again, just politely say that you have heard it from him already and that your focus is on you and your child and end it. Don't let him continue to use you as the scapegoat.
M-43 W-40 2D - 9 and 5
Emotion, yet peace. Ignorance, yet knowledge. Passion, yet serenity. Chaos, yet harmony. Death, yet a new life.