Listen man, if you grasp this, you will be ahead of 75% of this board. It's quite simple. She either likes you, or she doesn't. If and when she doesn't, there is nothing you can do to make her feel attracted to you. You can do something like hit the lottery, or make her feel jealous and hit her ego to MAYBE make her feel pressured into hooking up with you. But that's NOT attraction and that's NOT interest level.
Being unpredictable won't do a damn thing if she doesn't like you. Imagine a fat ugly girl who liked you, and now doesn't. You weren't and aren't feeling her...so by being a challenge she is doing you a favor. If you can understand this you will be in a huge position of power because you won't waste time trying to 'change' chicks with tactics. Go in there, be real, be a man...free yourself of the old way you thought you need to be to get chicks (AFC) and free yourself from the new way you thought you needed to be to get chicks (DJ). Go in there and say what you want, when you want. Get her into a position where she has to SHOW you if she's into you or not. Based on that, you know whether it's time to move on or not. Don't take it personally.
-Blitz