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I don't think such things should be planned or thought too much about.
If she asks a question, answer it (Golden rule: never ask a question if you don't want to know the answer).
If she doesn't ask, well don't make plans to tell her, it would sound like a conference (How was my relationship with the ex, by John Doe) and would end up pretty akward anyway. Chances are the infos are gonna get through by little bits, in casual conversations, and she'll eventualy get the big picture as she gets to know you better.
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