What does it mean when a guy observes you?

On a snack and drink party I saw a guy observing me all the time. When I got me something to drink or to eat and turned around I saw him looking at me all the time while he sit there at the table with the others. I really wonder why and what he was thinking. I felt very ugly and was nervous and shaking. Probably he was just looking why I am shaking..
What does it mean when a guy observes you?
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