Don't know how to live after a break up

i really need to get this off my shoulders. I've been dating a really nice girl throughout highschool (we are both 17 atm), but I moved to another country for uni and she is still a senior and studies in my country of origin. She broke up with me because of lack of connection and her wanting to not be restricted for the end of her highschool year. I am really depressed over it because those years of dating were really sweet. We didn't have many problems and we solved them quickly all the time. We also had many long-term plans as she was planning to go to the same uni. I am especially heartbroken over the fact that we spoke the same morning and had an argument (a joyful one) over who loves who more.

What should I do now? How do I work through this mess?