This was coined by Shakespeare and was quite a favourite line of his. It appears in several of his plays, includingTwo Gentlemen of Verona,Henry VandThe Merchant Of Venice; for example, this piece fromThe Merchant Of Venice, 1596:
JESSICA: Here, catch this casket; it is worth the pains.
I am glad ’tis night, you do not look on me,
For I am much ashamed of my exchange:
But love is blind and lovers cannot see
The pretty follies that themselves commit;
For if they could, Cupid himself would blush
To see me thus transformed to a boy.
It means when you truly love someone it can bo so overwhelming that you don’t realise whats going on in the world around you. also that the person you’re in love with isn’t quite as gorgeous as you believe usually happens after it ends and you’re like “what did i see in him/her anyway”.
Modern-day research supports the view that the blindness of love is not just a figurative matter. A research study in 2004 by University College London found that feelings of love suppressed the activity of the areas of the brain that control critical thought.