A good thing to do is to take her to places where there can be “wind in her hair”. New places, new events, new people, new activities. Everything should be new, new, new. Then you won’t be associated with the breakup, you’ll be associated with giving her new adventures! Let her cry and wallow in the familiarity of home. Pick up the phone when she wants to talk. But actively introduce her to new things. Then that guy will be soon a distant memory.