This is one of the most suck a*s situations. What is with your children's father? Has he flipped? Why would he be so interested in all of the fuss and aggravation that he is taking his kids , himself and you through? Is it worth that much to him to try to hurt you?
HOW SICK! I am sorry but that it sick. I feel for the kids and you. But, he and his current wife will reap every bit of what they sow,do do not fear that. Okay? Not in our time, but in God's time.
What can you do for yourself to make YOU feel better today?
I am not sure what else to say but I will say this. You are better than this, have nothing to fear.