What is the name of the song in the commercial on TV where a man and woman is stopped at a red light and he grabs her hand and slides a necklace in it?

Some of the words are like
I think maybe I've fallen for you
Possible fallen quite hard over you
I've seen the paths your eyes wonder down
I want to come too

It's a real song?
I thought it was just a cute little jingle.
Hmmmm, wonder what it could be. Now I'll be thinking about that all night.