
Not to say that being aro is bad, but in this case after hearing about what Fukami went through with a past boyfriend and how his parents both passed away seemingly unexpectedly ofc the guy would be terrified to fall in love or cherish someone deeply ever again.
With family he's got the excuse of "we're related so I have to love and cherish them", but with a romantic partner you could just choose to close them off or deny your own feelings to avoid being hurt.
I'm happy his sister said something. Hopefully this snaps his head out of his ass and makes him realize that living in fear of losing someone isn't an excuse to hurt himself and those he loves.
I went through the same "I can't fall in love so I must be aroace" period after my first intimate relationship I had left me with severe trauma. It took me nearly a decade to finally work through it enough to realize I can actually feel romantic feelings toward someone and now I've been in a loving, sickeningly sweet relationship with my current partner for nearly 5 years lol