I feel like the other posters, that he is trying to play the nice guy role, just to get you to go along with whatever he wants you to do, like signing tax papers. He knows from the past that you can be led easily. Be very careful with him, he seems a bit sinister to me, asking about your life insurance. That's just not the sort of thing a man who has left his wife and child just comes up with unless there is a very good reason.
And make sure your sons college money is well protected. Do not let him get his hands on that. Surely you have already done that?? Otherwise your son is going to be asking you next year when it comes time for the financial aid paperwork to be filled out what happened to the money. Right now you and your son are more important than getting your H back. See that lawyer, and get the answers you need.
Your H has to figure himself out, let him be and take care of your son and yourself. And by the way, how is your son doing now? How is he emotionally handling all this?
Also, you said you were afraid of losing the house y'all inherited? Why not sell it, before that can happen, and pay off any debts with the proceeds?
And, rysmom, please don't take what everyone says as being hateful, we are all just trying to help you. None of us is saying for you to just give up on your marriage, until YOU are ready to do so. We are frustrated, wanting to help with good advice; common sense advice, and it sometimes seems that you ignore it and have no response at all.
Good luck, I hope you get the info you need soon. vc