How you guys feel when some girl remembers your birthday?

There's a colleague of mine whom I like. I have been giving him glances and he too. But usually he had turned his eyes away at once if caught. Today was his birthday - and I was the first person to wish him at office. We are not even added on Facebook. He had told me 3 months ago, randomly. After when I wished him, I saw him a bit numb so I asked him: "your birthday was today or not?" He said, "yeah!" And then I saw a little smile on his face. Did he get any hint that I love him?
How you guys feel when some girl remembers your birthday?
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