I will have to end my relationship with my girlfriend due to my studies, what should I do?

I'm in a relationship for 1.5 years now. We love each other, but this year, I want to travel abroad to study a masters degree, meaning that I will have to end my relationship with my girlfriend. She knows this is a big dream for me, but everytime we talk about it, she gets pretty sad, and of course, I would never want to hurt her. How can I handle this situation with her? What can I do to reduce hurting her?
I will have to end my relationship with my girlfriend due to my studies, what should I do?
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