NOT SHAKESPEARE (and certainly not Hamlet, Act 2 Sc 2, which stars Polonius, Queen G, Claudius, R&G):
When I saw you I fell in love and you smiled because you knew.
SHAKESPEARE; in fact, Hamlet Act 2 Sc 2:
Doubt thou the stars are fire;
Doubt that the sun doth move;
Doubt truth to be a liar;
But never doubt I love.
Good, glad we sorted that one out.