What does it mean when a guy asks if I miss him?

Anonymous
I've been close friends with a guy for over three months. Lately we've been discussing how much we like each other (romantically) but he has a girlfriend so we keep it platonic. Today, out of the blue he asked "do you miss me?" (we haven't seen each other in a few weeks but talk every single day). I asked why he was asking after I said of "of course" and he laughed it off a bit and said he was just fishing (seemed embarrassed a little. What does it mean when a guy asks if you miss him? Anything behind it more than just wanting to know?
What does it mean when a guy asks if I miss him?
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