Just because something doesn't work right now doesn't mean it will never work. It's your choice, but if you care for this girl, I'd suggest just going with the flow and see where the current takes you. In the meantime, there's nothing wrong with playing the field a bit. Being committed to someone can be the best feeling in the world if it is mutual. If it isn't, then it can be about the worst feeling in the world. With that in mind, I leave you with this bit of insight from someone who used to be in your situation....a LOT. If you focus on one thing, and one thing only, you miss a lot of things along the way. If you keep your eyes open while going towards a particular goal, you often come across better options. Take it easy, have some fun, and know that eventually things will work out for you. It is very easy to get caught up with the *idea* of someone, rather than the person themself.
As they say, time heals all things. You'll be over it and wondering what the hell you saw in her in the first place in no time