The guy I like has a very neutral, cold personality...what do his reactions mean?

We work together. He lives in a different town than me, and I have never met his family or friends, since they live like 30 minutes away. This is how he acts: -smiles when I make a joke. -smiles as he teases me(btw...he smiles rarely) -blushes when he sees me sometimes -we won't talk for a half an hour... show more We work together. He lives in a different town than me, and I have never met his family or friends, since they live like 30 minutes away. This is how he acts:
-smiles when I make a joke.
-smiles as he teases me(btw...he smiles rarely)
-blushes when he sees me sometimes
-we won't talk for a half an hour because he doesnt start conversations
-he acts as if hes annoyed with me, but says that hes just concentrating or busy.
-Told me he thinks I am nice.
-He said"If you have any problems with math, just ask me, and I'll try to help you out."
- I always start the conversations
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