How do I get closure?

I loved my first girlfriend to death. We dated for 13 months. We would visit each other every weekend in college. She told me that we had a future together. However, one day she just decided that it wouldn't work and she broke up with me over text. She cut me off completely, deleting all pictures of me off her social media. A week later, she was already with someone else. I entered a depression, my grades went to shit, and I ended up unenrolling a year later.

She ruined my life. How do I end this?
How do I get closure?
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