I am so sorry you are going through this. I do truly hope this is a cry for help and he eventually turns up and really does get the help he needs. He is clearly not well, needs to be medicated and with some intense therapy.
I hate to say this, but could OW know where he is? Or if you know where she is, you can tell the police where she lives.
When this is all over, I'll explain why I made that suggestion. But I think maybe leading help to him is the best idea.
Regardless, there is nothing you can do to save him. he's got to want to be saved. You have been a loving person through all of this. You've helped for HIM. You are a wonderful woman, no matter what, always know that.
