He lives like a Miller of Dee and cares for no one.
Miller of Dee
idiomSomeone who lives independently and unattached to others, especially for selfish reasons.
Origin
disputed originFrom the traditional English folk song Miller of Dee, in which the eponymous miller sings "I care for nobody, no not I, if nobody cares for me."
She acts like a Miller of Dee, ignoring her family to focus only on her own comfort.
The hermit lived as a true Miller of Dee, content in his isolation and indifferent to the concerns of the village below.