If anything, you’d be happy that your ex has decided to move on.
Just express it in your own way, with minimal damage to those around you. Just don’t try to hide your pain under a steely faà§ade of composure.
Have your moment of sadness and realization to let the news sink in, and then try to move on.
#2 Realize that your ex moving on before you is okay.
Imagine you’re just sitting at home, looking for something to do.
And then for some reason, you remember one of your exes.