<human>: Could you distill the essence of the text into 1-3 sentences?

Been good friends with a girl for about half a year or so. We usually talk every day or every second day. About 3 weeks ago she suddenly just started acting a lot differently around me - she stopped talking to me and cancelled our plans to go out that weekend. 

Since then she rarely answers the texts I send her, and when she does I can tell she doesn't really want to talk to me, and she hasn't picked up the phone when I've tried calling either. I don't remember saying anything that would make her want to just stop talking to me and I'm confused on what to do from here.
<bot>: Girl went from being good friends with me one day, to not talking to me the next and I'm not sure why or what to do.