They don't exist.
They are just a bunch of exaggerated falsified tales of two individuals who come together to fulfil their selfish agendas.
It might sound cliched, but I have got prove.
Look around you.
How sure can you be that the couples we see each day are actually head over heels in love with each other?
Everybody is "in love" with another person for selfish reasons.
Attention. Money. Control. Sex. Services.
And this is just to name a few.
Nobody does it out of love.
That "butterfly in the stomach" feeling.
Those sleepless nights and day dreaming crap.
That constant association of everything with your lover.
It doesnt exist.
That happens only in the movies. Not in this disgusting world.