What does it mean when a man watches you from distance?

Anonymous
He is someone i know (confident, single,30's).I always noticed him staring at me, watching me from distance and not looking away when i caught him.We talk, but i am usually the one who starts the conversations.When i approach him he acts reserved and he always has a slight grin on his face when i talk.
What does it mean when a man watches you from distance?
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