Im curious to now if a guy sings a song right after you were singing it and continues to do it every time you sing a song mean he listens to you subconciously... or he is singing it so you know he was listening to you.. He knows I like him because I told him.The only reason we aren't going out is because of work...

I'm not sure whether it's a conscious or unconscious action, but if you know he likes you and the only reason you're not together is because of work, does it matter?

Maybe he just likes to sing, just casually ask him.

"Do you like that song, or just like to sing?".