I cant tell you what choice to make, but I will tell you this. From my experiences in the past, most long-distance relationships end up failing. Not because of the distance, but bc you cant ever know whats really going on with the other person. She may tell you that you have nothing to worry about and she may be right, but you never know. You will always have that doubt in the back of your mind and ultimately, it will become a bigger and bigger problem. Dont let it get to your head and let  her know how you feel. Tell her your concerns and let her know that although you want to be with her, it is hard on you because you cant see her as much as you'd like which leads to you having doubts.  Wish u the best of luck