Did she really just say it? Did she really tell Auguste that they should date? It’s just now that Margaret realized what she just said. She is literally asking him to date her!
She now understood what Fatima said. It was the very same thing that Auguste said is the reason why Geoffroy thought of that excuse. It was to save Auguste's face from Astrid and her mother. It was to make them believe that he really have moved on.
Which is clearly not the case. But the truth does not matter. Astrid is getting married, and Auguste will remain the ex-boyfriend who was not able to move on from her. That will be his forever identity if people will not know that he has found someone to date.
And that is what Margaret wanted to help him with. In exchange for what he has done for her family, Margaret wanted to save his reputation. And pretending to have a relationship with him is the solution that she thought off.
"M-Margaret... I-I don't think... I-I get what you..."