Why does Marina give Victor a dirty look?

When they're out for dinner/dancing, and they leave their jackets etc at the table and go out to the dancefloor then someone takes their table. Victor goes to explain to the people who took it that it is their table. Then Marina looks at him like she is disgusted. Does anyone know why? Then not long after that she goes off on holidays without him.

But all in all, it was a great movie, one of my favourites.