Most Helpful Girl
It looks like she's wrestling with her feelings a bit! She obviously likes you, or is at least interested, but it sounds like because she has a boyfriend she's holding back on making a move. DO NOT make a move whilst she's still in a relationship - always ends badly! If she carries on flirting you need to make it clear where you stand, and if she doesn't give you a definitive answer then I think you should move on. She needs to make a choice soon as she really shouldn't be in a relationship and flirting with another guy at the same time! Hope that helps :)
Most Helpful Guy
Her game is she has a boyfriend. Which means off limits to you for several different reasons. So is she really interested? Would you want a girlfriend that acts this way when you are not around? She might be using you for an ego boost. She feels safe that you are not going to cross the boundary so she can play around with you, kind of like a cat toy. Lots of play but never actually going to eat. Bad news this one. Unless she breaks it off of her own accord you don't wanna play her game unless you can make it your game.