be past caring
To be unable or unwilling to devote more time and attention to a particular person or issue. Give him anything he wants in the divorce settlement—I'm just past caring anymore. Give him anything he wants in the divorce settlement—I'm just past caring anymore.
be beyond/past ˈcaring (about something)
have reached a stage where you no longer care about or are no longer affected by something: She can’t hurt him now because he’s beyond caring about what she says.