Be past caring
Definition 1 of 1
Pro Tip 1/3Emotional Fatigue
Expresses a state of emotional exhaustion where concern or care has diminished due to overwhelming circumstances. 
The constant arguments have taken their toll, and now she's past caring about the outcome.
Pro Tip 2/3Indifference Threshold
Highlights the point when someone has endured an issue so much that it no longer affects their emotions. 
After several flight delays, I was past caring and just wanted to go home.
Pro Tip 3/3Desensitization
Used when repeated exposure to a situation makes it seem less significant or troublesome. 
With all the chaos at work lately, I'm past caring about the small stuff.