Girls, she had a sudden loss of interest after the third date. Why?

Anonymous
Went on three dates with a girl that went well - both of us had a good time together, plenty of laughter, etc. After the third date, she suddenly stops responding to me and goes cold. Why? 
Updates:
2 mo
How can I get back this interest?
Girls, she had a sudden loss of interest after the third date. Why?
2
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