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Belittle her BF
Her bf is a nobody and must be treated as such. Refer to him as “your bf” when talking with her. In fact, codedly point out his flaws to her. Do it codedly. It should not be obvious. If it’s obvious, you’ll look desperate.
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Compliment her
Her bf is used to her so he’s “familiar” with her looks and everything about her. But that’s not the case with you. Adore her. Praise every new dress, hairstyle and picture. Appeal to her vanity and you’ll be in her bed soon enough. Trust me.
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Understand her
Know what she likes/dislikes. Know her body language. Once it dawns on her that you understand her better than her bf, she might break up with him. Her friends might even start campaigning for you at this point.