ok so the other night I am standing outside in line at a bar waiting too get in and the same sort of thing happened with 2 different girls. I started up light conversation with each of them and then cut it off, turning my focus back to my friends. After doing that I kind of noticed/felt like they were getting closer and were basically standing arm to arm with me. I know the line was tight but at one point our arms and elbows would be touching.

From what ive read it seems that proximity is usually when a girl comes over to where you are to get near you, especially if she has no real reason to be there. But my question is could the proximity rule be applied even in a tight line up by the girl trying to get as close as possible without making it obvious? or am i just over thinking a long and packed line? I mean even in crowds people like there personal space, even if it is an inch or two

could that proximity be something as small as getting a inch closer?

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Anyone can be confident with a full head of hair. But a confident bald man - there's your diamond in the rough.
- Larry David

Its a girls subtle way of saying she is interested in you, and that she wants you to make a move on her