My break up. Still feelings?

I and my girlfriend of 4 years broke up about 2 years ago. Today, I thought I saw her at a local restaurant. My heart started beating fast and I got a little nervous. Then the girl turned around it wasn't her, thank GOD. I don't think about her no more or even mention her to my friends, but what is that feeling. My friends told me that they see their ex here and there. I asked them if they ever felt the way I did. They would say no, unless they are lying. Have you guys/girls ever felt that way? If so what do you think the feeling was?
My break up. Still feelings?
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