Can you not be bi and have a girlfriend or girl partner? Thats not the worst thing in the world. Who know she may not mind if you are bi. If you are hers then it might not matter as long as you are faithful to her. Plus you don't know. So your not certin. You could be stright and need her help to find out. You night like bi things she's willing to accept and still be stright. In my opinion continue to persue her and see what happens. Will you hate your self if you don't at least give it your best shot.