What is she doing?

My ex and I broke up over a year ago, and since then she has been stalking me.
We started our summer classes, and she already figured out my schedule, and she will hang around my class and just keeps looking at me, but won't say anything.
I tried changing my route, and she found where I'm going, and she started passing me and her and her friends stare me down.
I just came back from a trip, and figured she was looking for me, and I came from behind them, and saw them looking for me and getting frustrated. After 3 days of me being back, they stopped at a median of my routes and each person was looking at one of my paths.
I walked past them and one said 'oh shit!'
What's the point of all this?
What is she doing?
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