Customer gave me his number, what does it mean?

So i work at a coffee shop and for a while now have had the feeling that one of my customers has a crush on me. Well today before he left he came back to the counter and addressed me by name and said "this is for you" and handed me a peice of paper. It was his name and number. Is he serious or just dropping his numbers off at coffee shops?
Customer gave me his number, what does it mean?
Post Opinion