What does "it was nice talking to you" really mean?

Anonymous
Sometimes I'll be having a conversation with a woman I just met, and when the conversation ends many of them say to me "it was nice talking to you".

These women seem interested in me during the conversation, so when they say that, does it mean they like me? How should I react if I am interested in her?
What does "it was nice talking to you" really mean?
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