Gets sick, can't move within seconds, and moments after he carries her to bed, she starts psychoanalysing her life and making profound-sounding statements. This is a bit too artificial.
It's better if you not think about it too much. some mc won't have any chance with heroine if they are with healthy family.
Example (spoiler): Even Amane from Angel next door spoil me rotten will not get any contact with Mahiru if not for her shitty ass parent and probably get buttfuck by his bully back in his hometown when he come back to visit his parent and he is one of the better romcom protagonist.