She may have realized that once a woman has sex, they get very attached to the man, emotionally, and she didn’t feel you were a good match for her, in spite of the sexual attraction, so she didn’t want to have sex and get emotionally attached to someone she knew wasn’t right for her in the long run. Sex for women is different than sex for men, and it changes relationships. She wasn’t ready for that change with you.
I hope that helps.
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