What Should I Do if I Suspect Someone Is Stalking Me?

I’ve been feeling increasingly uncomfortable about someone I know from school. He works a few minutes away from my workplace, but I’ve noticed him following me several times. He always stays behind me and mirrors my movements. On the second time I altered my route, he gave me a cold, emotionless stare, similar to what I’d expect from a psychopath. I also suspect he may have liked me in the past because I overheard his friends teasing him about me. Has anyone gone through something similar? Any advice would be greatly appreciated.
What Should I Do if I Suspect Someone Is Stalking Me?
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