Good sign that he is interested in me?

This guy I like, we haven't talked a lot yet, had said he liked the fluffy coat I was wearing one day.

I was working and he passed by me heading to the vreak room when he said he liked the coat I was wearing as he passed by. I said thank you and he said it looked warm. Never looking back at me and never stopped walking towards that room. Was he just nervous? Or something else? Or was it a harmless compliment?

Good sign that he is interested in me?
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