Is he being friendly or flirting?

I came around the corner not expecting to see the guy I like there and I must've been smiling or something because he turns around instantly stopping what he was doing and was like, "what" with an amused tone and his eyes filled with warmth and affection in a way and I think even a knowing smile and I was caught off guard so I played it cool by saying, "what? im just helping" the air felt like tension in a way and a lot of warmth energy I feel like

and then two days later we barely had time to talk and as I was leaving I heard a faint, "bye" and I turned around and I was relieved and happy to see him so I smiled and said "byeee!" and he had a serious ish look on his face but not completely and after I said bye his eyes still lingered on me so im not sure if it means anything because the tone he conveyed was unusual.

Is he being friendly or flirting?
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