For better or for worse, guys are expected to approach girls, whether it's to flirt with them or just talk. Now, if a girl approaches you, it
usually means one of two things:
1) She's interested enough in you to take the initiative after having waited to see if you would make a move, despite common social expectations, and in light of your lack of initiative (for example, I can see Scarlettlux doing this)
OR
2) She is
intentionally thwarting or disregarding social norms and is making a point of taking the initiative in showing interest in you (more along the lines of something Joy would do)
Either way, she's going out of her way and defying a social norm to talk to you. That means something. IME it's pretty rare for a girl to just approach a guy just to chat, and either way, she's probably going to make her intentions clear as long as you pay attention and don't make an ass of yourself :wink:
This is, of course, assuming a social atmosphere conducive to flirting. If a 40 year old woman starts talking to you in the airport while you're both waiting for the same flight, she's probably not flirting with you
But if you're in a club and a girl leaves her group of friends to come talk to you, odds are, she's interested.