I do not remember the lyrics or the tune of the song, but I remember the music video.. here is a description of what I remember

This girl is sleeping and the guy is watching her sleep by the bed and is singing for her , doesn't wake her up and he gets up and leaves the house, and gets hit by the car, he doesn't stop singing even as he is falling in slow motion while being hit by the car.

It's a really sweet pop song I guess but I'm not able to find it..

And through the song this scene repeats where he leaves the house without waking her up and gets hit by a car or something again..

I can't remember much else..

Helpppp