Was he flirting?

I was walking up a flight of stairs. I noticed this male coworker stood at the top of the steps stopped and said "well.. hello". The way he said it sounded flirty. It was a little odd, because he doesn't usually flirt. He usually has a deer in the headlights look around me. My other coworkers say he likes me. Any input?

Was he flirting?
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