I need girl help- advice please, this is important to me?

I think that your attention just got caught by something 'shiny'. I understand the attraction to something new & exciting but that rush you feel won't last & chances are she may still be that same annoying person underneath. In other words, if you leave your girlfriend for this other girl, there's no guarantee that the relationship will be as good as the one you left. It's more likely to be worse given that this girl has no qualms about trying to get with someone who's been in a happy relationship for quite a while, that says something about her moral values & her character in general. It's normal to be attracted to something new & exciting but most relationships don't last past that phase. It sounds like you've got something special with your current girlfriend & you should think long & hard about staying with her.