it had to be done
Vous avez dit qu'il le fallait parce qu'il courait un grave danger.
You said it was necessary because he was in grave danger.
— Des hommes d'honneur (1992)
Because it was necessary.
It was necessary.
Tom n'a pas pu emprunter autant d'argent qu'il le fallait.
Tom couldn't borrow as much money as he needed.