I understand how you feel. You have done a GREAT job of DB'ing. In the context of your H's interactions over the past several months, his recent pullback just doesn't make sense. Something must have happened that you don't know about.
You should do what your gut tells you is the right thing to do right now. Take care of Cas. Regain your physical and emotional strength. You may or may not change your mind when you are feeling better rested and stronger. ..................The only suggestion I would make to you right now is not to tell H about your change of heart. You have worked too long and too hard to keep the road home smooth and paved for H to sabotage yourself by making a statement to him now.
Please do something special for Cas today or tomorrow.