be beyond 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 beyond caring anymore. I'm a senior now, so I'm beyond caring about what the catty girls at school say.
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.