I’m in my mid-20s a man who looks like he’s in his late 30s (a cashier) stares and smiles intently all the time when in the store. what does it mean?

I’m an Indian living in a different country. I visit the Indian grocery store at least once a week, I shop alone or with my roommate. It’s been a couple of months since I noticed this. This cashier keeps looking and smiling at me. He doesn’t know English, and I only know a little of the language he speaks (Hindi, mixed with some other language). It started with staring and smiling and then with a Hello and then with How are you?
I’m a very shy socially awkward person, my brain automatically tells me to smile all the time. So, whenever he speaks, I nod or smile. If I catch him looking at me, I smile and turn away. So, with my shy awkward behavior, I probably gave him the wrong signal. I’m not interested in this guy, I don’t know how else to react, half the time he speaks I don’t understand much. For any Indians reading this, he speaks clearly in Hindi while asking a question and after my reply he talks in a different language mixed with Hindi.. kinda sounds like Punjabi (I don’t know). I don’t know if he talk like that so that I don’t understand what he says. It’s just weird. Sadly the store doesn’t have a self checkout, he’s the only cashier most of the time. If he’s not at the counter, I find him lurking around me somewhere, sometimes he approaches and asks a question and leaves. I shop in the evening mostly when it isn’t busy so when I get back to my car after shopping, I see him standing outside the store looking at me.
Here is the catch, he doesn’t make it obvious when I’m shopping with someone! I don’t know how to handle this situation 😐 I don’t know how to be rude, he didn’t do anything bad but making the whole situation weird/uncomfortable. I don’t want to engage in any conversations with him, how do I let him know that I’m not interested? I avoided going to the store for a month and I went shopping with my roommate after that. Still, it didn’t seem to help. I went alone yesterday and boy he was just staring at me and followed me out after checkout.

I’m in my mid-20s a man who looks like he’s in his late 30s (a cashier) stares and smiles intently all the time when in the store. what does it mean?
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