Why would a man awkwardly look away as your eyes meet?

We were sitting opposite to each other, listening to a romantic song from 50s and he was taking me a video of me blowing a candle and talk about my thoughts while I was looking around in the air, he had his head leaned in his head and look at me really sweetly, blinking his eyes, then at some point when I stopped looking around and looked at him back and smiled, while he was still staring at my eyes smiling, he looked at the window and changed the topic, about the weather.

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We had a trip and lived together shortly, it was the last night of our trip.
Why would a man awkwardly look away as your eyes meet?
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