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Mirroring body language is one of the strongest signs of attraction there is. Especially when guys do it. We don't really have a "friend zone" like girls do, especially not for girls we don't know that well, so most signs of attraction are probably positive indicators of interest. Guys have to be careful with this stuff going the other way though, because girls will show "signs of attraction" that actually suggest that they enjoy a guy's company, but not that they have a romantic interest in him; this is especially true if you've known a girl longer. It's incredibly confusing. I wish people would just be more open about their interests. But that's never gonna happen. I know I'm not gonna go around broadcasting my feelings like that, and no one else will.
If your cultural values are such that men are the ones that are supposed to take the initiative, you need to broadcast to this guy that it's safe for him to approach you, and that you will be receptive. How you do this, I have no idea. I wish more women knew.