Is this just friendly, or slight interest?

There is a guy at school. (I am older and going back, but I’ve found lots of other older ones there too, interestingly.) Anyway, he walked up to me one day at the locker and said “hi, I’m in the locker next to you”. Later, we in a small group activity together. I performed my role in front of the class with a partner. He said that we did excellent. After that, he started using my name. He would say “hi, *my name*, and “bye, *my name*. We make small talk sometimes. Is it just friendly?

Is this just friendly, or slight interest?
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