Why can't I tell if he likes me?

For over 2 weeks, i have been going to a busy coffee shop where a friendly man works. He always remembers my name, my order, smiles at me, tells me it is "good to see me", "thank you for the chat", i can peripherally see him looking my way when im waiting for my coffee, and it seems that he goes out of his way to ask how i am and start small talk... but i can't tell whether he is friendly or likes me. How can I tell? Why is he so hard to read?
Why can't I tell if he likes me?
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