I go clubbing every saturday night

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I go dancing and clubbing every saturday night. I usually go to aftershock and while I've been going there I've meet a lot of people. But recently there has been this guy that keeps checking me but he wont talk to me or anything. I know this guy and I'm too shy to talk to him myself. I knkow he's a really nice guy and all that. I don't know what to do to get him to talk to me. I've tried looking right at him while I'm dancing and I've tried lip sync talking to him. Last week it almost seemed like he sent in a friend to scope things out. His friend started talking to my brother and he would come over and watch me but not talk. This friend that he sent in usually they come and go together but last week he didn't leave with his friend instead he stayed and watched me. I know this cuz I was watching him. Is he interested? I don't know. I think so just by his acitons. What should I do?