I understand only too well the fear that both you Sanderika and Cas are feeling.
I have been there and am once again feeling fear to a degree with my latest little hiccup.
I was unable to follow through on some of Gucci's advice due to fear. Lucky for me I subconciously carried out some of his advice without actually realising I was doing it and it paid off - Gucci if you are listening, thoughts on latest hiccup would be appreciated.
You have to do what you feel is right for you at this point in time. Granted fear is a very powerful emotion and can prevent us from doing things we think we should because it is basically the fear of the unknown. Once you proceed to D there is the unknown that is waiting after it.
From my perspective, any small changes in your H's attitude towards you, deserves some time to see how much further it can go. You both have shown so much patience over the last however many years and bit more time won't hurt. I would wait it out a bit longer you just never know.