Could you explain what a FS is? What does that entail?
Did your H indicate how he is feeling about the legal proceedings?
You said your H told you about how unhappy he was and had no choice but to leave. Do you think he found his happiness after he left the family? Has he talked about any regrets or remorse in leaving the family?
Has your H given you any indication about whether an ow is still involved?
I have to say that I think you've been handling this situation very well. Continue to guard your heart. One thing we do know about MLCers and that's that there can be forward steps and then drawbacks while they process their thoughts and feelings. Time will reveal whether this is a touch and go or a sincere attempt to reconnect to the family that he left behind.
It sounds as if you have found patience in your journey, not only for your H, but with yourself as well. Well done.