She led me on, told me she wanted a relationship with me, then rejected me, I ended the friendship and now she's crying. What is going on?

Anonymous
Hey, so I've been friends with this girl for 4 years, started to like her romantically last year; let her know since last fall, she said she wanted a relationship etc. wanted to do sexual stuff with me etc. Then after taking her out, we kissed, hugged etc. A few weeks later I arranged we do something when College ends (May 29th); then she tells me she just wants us to be friends, she's slept with two different guys, and is now going on dates with another. I just said no, you've disrespected me, used me and led me on, you don't evidently care about me at all so I don't want to be friends with you anymore. Also said to her that was a really rotten thing to do to a guy who's done nothing but love and care for you, for nearly half a decade. Goodbye and good luck with her your life. Fast-forward, three weeks later she's crying apparently and her friends are telling me she wants me back. I've just said no, she's got to grow up and work through these issues on her own now. I'm done being taken for granted. So, could someone tell me why she led me on, disrespected me and then is now proceeding to make a scene about me standing up for myself? Any advice on how to handle this would be great please. I'm not really a people person and all my relationships in the past have been long term, committed ones. I don't sleep around or anything, so I don't understand this kind of behaviour. Thanks
She led me on, told me she wanted a relationship with me, then rejected me, I ended the friendship and now she's crying. What is going on?
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