What am I supposed to do now

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Hey /adv/, hope you can help me on this
I'm still in higshchool, but as you know, in september we go back to school to a new year.
In my country, public higshchools are really damn popular, everybody wants to get in every year, even if they already had a school to go to the last year. This ex of mine did her exams and she passed them, in theory, she should've been elegible to enter the school she wanted to, right?
We were this kind of couple that would be breaking up and getting back, and she was too jealous, it was not healthy. I decided that I would change school, but I would remain in a private school, because it is easier to get in and we can afford it. And out of nowhere, she texts me saying that she was going to the same school as I was. I wanted to start completely fresh, because the first year in my former school was terrible. And she picked the same study plan as I did. That school doesn't have too many students so we may even be in the same class. I don't want to talk to her, she hurt me too much. She told me she would talk to me because I'd be the only known person to her. I can't change school again. What do I do? Why do you think, out of all private schools there are, she had to choose the same as I did?