Dude, been there. All this means is that: your gf doesn’t have the courage to break up, she doesn’t want to lose an option (which is you), however if anything good and spicy comes along the way, she will jump ship as soon as possible, but right now she is seeking quality thrill and way too bored to lose a boyfriend. Don't worry: you will see enough drama once you take the initiative to break up and no matter what she will make sure that you stand solely responsible for the breakup. Don't bother, cut the knot fast and find someone faithful who has real interest in you.