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Take a deep breath! The good news is that it's not the end of the world. One of the many reasons behind this may be psychological tension that can make you feel the need to pursue someone not interested in you romantically. You may also consider asking yourself why you are considering pursuing her in the first place. If you are already friends, she might like your personality and give you an honest answer. Maybe she doesn't want to date people that she goes to school or work with.
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She might have a dozen reasons, such as she's not interested in a relationship right now, she's not attracted to people of your gender, she's focusing on her career or education, or she has friendlier feelings for you, etc. What it means is that, for her sake and yours, you should give up trying to date her. That doesn't mean that you have to stop being friends, as long as your romantic actions haven't made the other person upset or scared.
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