Bright, Only you can decide what is best for you. Your h is mia and he's not made a move one way or the other about the situation of whether or not to stay married or not and yes you are curious. He knows that you will take care of things and that's a compliment in many ways, but there are times when it gets to you. I get that, I really do.
I do think the mail situation bugs you, but it's really not the main thing that does...it's how he communicates w/you. When he communicates w/you, it's usually very short and impersonal and it bugs you because you know that this isn't the way he use to be. I don't think he's testing you. I do think he knows that you'll take care of things for him. Bright, he knows you very well and knows that you will not do anything to harm him in any way and he also knows that you care enough about him and others that you'll go out of your way to make sure his mail or other transactions are taken care of.
If you need something from him, then ask. Don't be afraid to do so. I may be wrong, but from what you've posted, he's not going to take any action in the way of divorcing you. He's quite comfortable w/the way things are. He probably doesn't even think about how this separation is affecting you because you remain very calm and do not make demands on him when you communicate w/him. He may very well think that you are just as content as he is w/the way things are. No one truly knows what goes through their heads unless they spew forth.
I wish that things were different for you and your family. He may very well be one of those guys who continues to live off the radar for many years to come. No one knows what the future holds, but we have to live our lives to the fullest no matter what happens.
Bright, you'll know what you need to do when the time is right.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.