You met a woman

Léon: Tony... All the money I make, that you keep for me...
Tony: You need some money?
Léon: No, just curious... Because, I've been working a long time... And I havent done anything with my... I thought maybe someday I could
Léon: use it.
Tony: You met a woman.

Léon: The Professional quotes

Mathilda: Do you "clean" anyone?
Léon: No women, no kids, that's the rules.
Mathilda: How much would it cost to hire someone to get those dirtbags who killed my brother?
Léon: Five grand a head.
Mathilda: Wow. How about this: I work for you; in exchange, you teach me how to clean. Hmmm? What do you think? I'll clean your place, I'll do the shopping, I'll even wash your clothes. Is it a deal?

It's my best friend. Always happy. No questions.