Being with your girlfriend through this, can make your relationship even stronger. One hour distance can't ruin love, but, ...are you sure you love her enough to share with her all the though moments leukemia can bring?
I know it is hard for you, but, only you know the answer of your question: should i stay with her and try to let us work?
What type of leukemia she has?
Best wishes for you and your girlfriend!
Marija