That numbness can just be a defense. Your mind/body has said, well that's enough of that rollercoaster, we are getting off whether you like it or not.
I have felt this from time to time, also felt detachment and while it used to annoy me at first I now welcome that detachment, enjoy it. When things are emotionally volatile it's a little oasis.
It can be temporary if it is emotional numbness or maybe you are just done - done with all the emotional ups and downs.
No it isn't wrong, it's how you feel. No one is an endless well of compassion - no one.