In the music video, two young girls (one slim, the other larger in size) have something like depression. There are often scenes in the bathroom when they start crying, between scenes there is the songwriter who sings the song. At the end of the film, both girls are lying in a bathtub filled with water, they are before the suicide attempt itself. In the end, the slim one does not decide to take this tragic step, the other one cannot stand it and plunges into the water committing suicide. At the very end, the lively one of them is shown hanging out with friends - I think this is meant to show that it's not worth committing suicide, because everything will pass one day.
I might have mixed something up, it's been a long time since I've seen it but if anyone associates something similar then please send me the title, I'd be very grateful. I will also add that the song will be about 6 to 8 years old.