Chat what could they want?

Recently started working in this new shop as a cashier. I would describe myself as a nonchalant person so it's not like I'm too sociable imo.

Enough about me, so there's this customer that has started being a frequent customer of ours, but they only buy eggs. I think we are around the same age but I'm unsure.

Last Saturday, this specific customer bought eggs at our store, then again, during the Sunday evening and i have a feeling they might be back.

So chat, am i just being paranoid or do you think the customer might actually want something from me?