What does it mean that she looked back at me?

I really like this girl from my church and when she was leaving with her group of friends I took a couple of steps back from my group of friends so that I could watch her leave. They walked for about 100 feet while I watched and when they turned around the corner she looked back at me.
For context, before leaving we weren't talking to each other, she was with her group of friends and I was with mine.
What does it mean that she looked back at me?
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