Is this a joke or possibly have meaning behind it?

So a guy helped me with some work place problems I had. As a thank you I bought him a coffee and left it in my friends office. My friend said to the guy “ misty had left a message for you in my office” and his reply was “ is it her number” this guy doesn’t know my lady friend told me what he said, maybe he was joking? Or could there be some meaning behind it. Also I’ve bumped Into this guy in a local supermarket many a time and twice he has said to me … that when he goes there he looks out for me, I’m not sure if I’m being hopefull or maybe he’s just nice and having some banter?
Is this a joke or possibly have meaning behind it?
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