Deep stare and half smile?

Anonymous
There's this guy, when he talked to me he tend to gaze into my eyes a bit more longer than he is with anyone else. But I couldn't catch him looking at me most of the time (either I'm too slow or he really didn't look). But, if I come up to talk to him, he will look at me with this confident/charming stare and have this half smile on his face (the kind of smile that shows confident/seducing?). He was more friendly with me before, more honest grin and honest staring at me, but now it looks more different, less grinning, more half smile and deep gaze (the kind of gaze that makes you nervous). Did he lose interest in me or what?
Deep stare and half smile?
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