Why was he looking at me at the party?

A party took place and before I've been talking to this guy. He asked me a lot of questions, but only until we were alone. As soon as others have arrived we gone away from each-other. But I caught him observing me all the time that night. He sat there with his friends at the table and was looking at me. I caught him when I got me something to drink and turned around. What was going through his mind? Why was he looking? I really wonder, cause I hope I did nothing wrong when we were talking
Why was he looking at me at the party?
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