I think I'm falling for her, but why am I so worried?

We've been dating for like a month and a half of so. Obviously she might feel differently, but I think it couldn't have gone any better. I probably could have kissed her the night we met, but it's all good. I just feel this fear inside the more I realise how I feel when I'm with her, and without her. What's going on?
I think I'm falling for her, but why am I so worried?
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