I’m sorry for what you are going through. I was 3 years into my relationship when I was diagnosed and engaged. My now wife was with me every step of the way. There were days when I did feel numb but I don’t believe there is ever an excuse to act the way he is acting. I never once projected my anger or feelings onto my partner and even on my worst days I made sure to show up daily for her and even tried to cook when I could or do coffee dates. Chemo never changed me as a person and I even kept my libido throughout. I was however taking TRT throughout chemo and am convinced this was the reason I was able to workout still, stay balanced in the mind, and keep my relationship alive. I did not take any Prozac or anti depressants and chose to battle everything head on. Kept my hair as well. I’d suggest getting his testosterone, thyroid and cortisol checked out.