Why was he stacking my every move?

This guy I’ve been seeing and I were both at a soccer game. while at the soccer game he left his friends and went where I was and kept looking at my every move and even notice the time that I left the game. I didn’t notice but my friend told me on the way home. is this just how a guy acts when he likes you or should I be worried?

Why was he stacking my every move?
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