what do U do in this kind of situation

So.. I just got bck fr my nearby store browsing as usual my all time favourite snacks, without realizing there's this old man around sixties had been looking at me. First thought i had was
"well maybe he's just happened to look at me and I happened to look at him too. No big deal"

I just felt smtgh is not at all right with that man. How can he followed me whenever i went into section by section of snacks as if afraid to lose out my tracks..u knw..like a lil kid who's afraid of losing his mom..I made things sound easy by telling myself I dnt wanna make bad assumptions for him. When i squatted dwn reaching for the snacks i wanna buy, he scanned at my thighs..
I got up, turned to him and glared at his perverted look.

DOnt wanna mess around with him anymore, I straight away went up to cashier only to knw he was behind me pretending he's done buying and he needs to pay up too..sickening..I was thinking how shld i go bck walking in a dark road to my home at that time..up next with him paying, I hurried myself opening the glass door making sure im safe he's not follwing fr behind, I turned back and noticed he looked back at me too but was stuck in front of the cashier with his things..
GOod thing the cashier went on slow doing the machine thingy..phew..

Sickening pervert old man. Never mess up with this kind of man. so much of a trouble just to get that one snack..