How should I react to a kiss on the cheek?

I went on a first date with a guy I really like a couple nights ago and we're seeing each other again tomorrow. The other night, as we were saying goodbye, he kissed me on the cheek. I loved it. But I was stunned. I didn't know what to do. I stutured a quick goodnight and stumbled back to my car. I sent him a text when I got home thanking him for the fun date. Guys: how are girls supposed to react when you kiss them on the cheek? What does it mean? Should the girl kiss you back?
How should I react to a kiss on the cheek?
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