Why would a man look at me and smile when he sings “I love you”?

He’s just a coworker, there was a song on play and he sang along, smiled and looked at me while saying “I love you”, later on I was watching a performance and when I looked around I caught him looking, he quickly looked away. 🤣 Gosh, reminds me of when I was a teenager

Why would a man look at me and smile when he sings “I love you”?
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