First off let me say hip hip horray about your test results!!! That is super great!
It does seem he is distancing himself. It sounds as though he has some assets. I know in the state I live in anything you acquire during marriage becomes marrital assets. Have you spoken with an attorney at all?? I am sorry if you have said before, I cannot remember.
It is overwhelming. No one can tell you what is right for you, so keep working on you so you can figure out what is best for you and your son.
Hugs!