The lie at Théâtre Princesse Grace

In the street, Alice surprised the husband of one of her friends with another woman and is faced with this heady dilemma: should say what she saw? Paul tries to convince her that she absolutely must hide the truth.

He thus praised the lie ...

Is it only to defend his friend Paul or did he also have something to hide? Unless it is Alice who masked advance to better make him confess his lies ...