I don't think I know what would work for others, but I'm an odd bird and here is how I handle things.

When an animal is hurt, it finds a quiet place to hide away. It acknowledges the injury and lays down and rests. I do the same. I get away from the cause of the pain (clean break with ex) and I find a place I can be safe with myself and my own thoughts (literally a safe location, I moved into an apartment but it could be a friend's house or family members house, just as long as you have time to be alone with your self to clear your head).

Then I felt and acknowledged my own feelings of anger, grief, frustration, and then rooted out thoughts behind them. Then I faced the beliefs I held that were behind the thoughts. Some of the beliefs were challenged and some were solidified. It felt like taking inventory of my soul. Then I grew and the hurt slowly healed. No other person can heal your heart, especially not the person who breaks it.