Fairly great advices here. Just want to add my two cents : remember that cheating is the symptom of a relationship that's already gone bad. It must have been pretty un-salvageable even before you got to know about the cheating; you just didn't know. Keep this in mind whenever you feel like reconciling.

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I think you should talk to her a few times, not to provide her the satisfaction, but to actually know where things went bad. And to learn as to how you can avoid making the same mistakes - if those were your mistakes - again. There are possible scenarios where it could have been a one-time mistake - excessive drinking the night before comes to mind. Listen to her side of the story, but at the same time don't be overly willing to believe everything she says.

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And be strong - Time heals everything.