We're both 18, last year of high school.

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Met her through my sister, who brought her to our lunch table. We kicked it off pretty well, ended up having sex a week later when we went to her house for Halloween. She seemed to enjoy our fling very much and the next couple of days would follow me around everywhere at school. Send sexual shit over snapchat, just generally very into me.

This week she was different. Would always leave from lunch, said she needed to learn. Started pouring a lot of emotional stuff onto me about another guy who forces her into a relationship with him via blackmail. Not sending anything on Snapchat anymore except brief replies. Some discussion about her liking another guy that she had with my sister. Would pull away from kisses saying that someone at school might see us, and would not meet up during free periods in a quiet spot that we reserved for our rendezvouses. This is the only place we can meet regularly, as neither of us have a car and parents are always home.

We settled that she should come over this weekend, and we'd smoke and kick back as my parents aren't home. Later on when I ask her about it she changes her mind and tell's me "idt I can make it this weekend" and that's it. The whole thing reeked of disinterest for her side, so I removed her from my Snap and became more distant from her the next day - brief and courteous, but not kinoing or flirting with her anymore.

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She bugged the hell out of my sister and her friends, asking what did she do to get me upset enough to "delete" her from my life. Today she confronted me and asked me why I did it, if she did something wrong, if I'm not into her or upset or something, to which I say "Not into you? Is there something that you did to make me upset?" or "Oh? Did I delete you?". She ends up walking off, and her friends said she was crying and didn't know why I was so "bitchy" and "silent" and "rude".

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My sister says that this girl is putting in a lot of effort and investment into me, and that it's cruel that I'm walking away, and that I should just tone it down and see where it goes from there. Did I honestly overreact? What should I do from now on?