Why do her friends look at me like this?

Basically the girl I like I ran into her at the bar (she's been shy around for me for a while staring at me everytime I saw her) said so I tapped her and she said hey and smiled and I hugged her and kissed her on the cheek and then went back to my business talking to my friend that's a girl and I noticed her friends looked at me with no smile. What does this mean?
Why do her friends look at me like this?
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