>It really, agitates me when people don't respond. and tbh, I just want to throw this off me =D

Just forget about it. One could speculate about the reasons, but it's pointless, there are far too many equally plausible possibilities. The bottom line is that she is not answering you.

More importantly, you should think about where you stand in relationship to your current girlfriend, because independently of the second chick, you have a serious problem there.