My girlfriend broke up with me and it hurts a lot. I still love her, but I may never see her again.

What am I supposed to do?

I’m a 21-year-old Japanese guy. I was dumped by my girlfriend I had been dating for a year and a half. We broke up before I could accept it, so it doesn’t feel real, and I feel like I’m losing my mind.
There’s no one I can meet nearby, and I’m alone crying.