Guys, Is he flirting through singing specific song lyrics out loud? Does it mean something?

[Anonymous]

I feel a lot of sexual tension with him and flirtatiousness. At work he gets so playful when I'm around him and now he's sung certain phrases
"JUST THE TWO OF US"
"THIS COULD BE LOVE" even a couple others.
And it seems like he's playfully in his "zone" but only when walking past me or knows I am in the room. I don't know if it's because of the context of us and it's making it seem like something, or if he's really maybe playfully hinting with me?

[virgin20]

It's a safe way of flirting as he can play it off as song lyrics. Maybe sing some back