Long distance thing- do I break up?

i understand your problem!its depend what you both want.don't compromise here.if you both want each other then no question of cheating! but if you think u cant leave her because she might hurt herself ,then its a sympathy!!by this base you cant be happy.so better you let her understand that you are not good for her.(if you don,t want to hurt her in future).BUT f you love her and want to be with her no matter what then just be sure that u wouldn't leave her!best of luck for your life