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She is evaluating the pluses and minuses of getting back with you. Thus, in recalling the minuses or, in other words, the issues she had/has with you, she becomes cold towards you. Perhaps due to the anger, hurt, resentment it also causes her to revisit.
On the hand, she becomes hot with you when she recalls the pluses of being with you. She is basically saying that she is going to exercise patience in making her decision no matter what happens.0