Does your son cry to stay with you? If he is showing signs of not wanting to leave, then that could be her reason of not prolonging the exit scene.
Sandi, how have you been doing? To answer your question: So far only once verbally, since she moved out. Other times, he's more than content to just keep doing what he was doing when she walked in the door (i.e. play), being a little boy he is. But as I've posted before, our son will get a little clingy to her and/or tell her "Stop talking, mommy" if he senses that our conversation is moving beyond just a casual exchange.
UPDATE 5:45am Had a horrible, horrible sleep. Two nightmares in a row, with my wife as the main character. I just kept seeing guys (especially ones I know) finding out about our situation, how she's now available again, start expressing strong interest in her, telling her that they've always had a crush on her because she's so sweet and nice and sexy, and she was loving the attention. In the dream, I remember telling her about it, and she simply says, "I thought that's why you have therapy". There was so much emptiness, distance, and helplessness...I woke up feeling the same way, hyperventilating and depressed.