Ex shows up to my job as a customer, should I question it?

We didn’t date very long. We left off on bad terms, a big argument then radio silence. it’s been a couple months since then. Recently he came to my job to switch phone services. There are 3 other stores in the area but he came to mine. He came 3 times to buy things which I am totally okay with but I was skeptical still. Recently he came and I assisted him. He left and nothing happened but a couple days later he texted me asking me a question about the item he bought. First time we talked since the argument. I helped him and that was it. Nothing else. I’m just curious to know your opinion on this.

Ex shows up to my job as a customer, should I question it?
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