What does it mean when a girl meets you and says it's not a date but clearly shows signs of interest?

So I met this girl once when I was out, there was little interaction, but we didn't really get to talk, after that, I saw she followed me on social media so I started talking to her. one thing led to another and decided to meet, in between she wrote me it's not a date, when we met we had a few drinks, a good conversation and we kissed several times, even in a quite passionate way I would say. so what's the catch here? is it fear of relationships or something like that?
What does it mean when a girl meets you and says it's not a date but clearly shows signs of interest?
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