WHY DO LOVE SONGS EXIST?

with this pain,
I know I'm not aLone..

with this tears dropping from my eyes,
I know I'm not aLone..

with this bursting heart,
I know I'm not aLone..

I KNOW I'M NOT ALONE WITH ALL THESE..
some peopLe have gone thru same pain.
AND STAYED ALIVE. =)

WHY ELSE COULD THOSE LOVE SONGS EXIST?