How do I let go of someone just using me for attention or lying?

Anonymous

She doesn't reciprocate anything I do and I always have to initiate first. At the beginning my friends caught her checking me out several times and she acted very nervous around me and still does. So I asked her out where she said that she didn't view me that way and was being friendly and had someone else. Okay I thought I just wished her well and end of story. After that, instead of respectfully leaving me alone she would sit near me and on my table directly opposite me. She'd also move close to me (lean into me), play with her hair and adjust her clothes when she saw me. It was really funny because when she saw me her whole body language changed and she started acting nervous. I was still hurt about the rejection but still said hi and thanks and that's it. So I'm going to guess she's either lying (play some sort of game) she likes me or just using me for attention. So what would be the best methods of moving on?

How do I let go of someone just using me for attention or lying?
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