I haven't responded to your posts lately because I didn't know what to say. I don't know anything that will help your situation with H and OW and I am sorry. The one thing I wanted to say was that you need to stop calling and leaving him taunting voice mails. All you are doing is digging yourself further in the hole. I know you are mad and want to lash out but it isn't going to work. I'm sure he knows how long he has to respond and if he doesn't then let it be. You calling him isn't going to make him jump any faster.
You need to keep focusing on yourself and your kids and not worry about him anymore. I know you still love him but calling him and saying those things to him will not make him love you back. You need to not worry so much about him anymore. If you step back and give him breathing space, he may come to the conclusion he misses you and the kids. Right now I am sure he is afraid because he made the mistake of getting OW pregnant and knows you are mad (which you should be). He doesn't want to talk with you so you can keep bringing that up and reminding him of his mistakes. Don't even mention that when you all talk. Try to stay happy and upbeat when you talk to him. There is always a chance unless you keep pushing him away.