Doing a bit of armchair psychology, I'll bet some of it has to do with the fact that she's mentioned that she and Matt hardly knew each other when they got married. They had only briefly met 3 times, and wham, they got married. She said that she felt that as a little person (in those days) her options for meeting someone were really limited, so when Matt came along, (and he was probably very cute and funny and charming) she thought he was the 'best' that she could get --- so she married him. As it turned out, he was very different from what she apparently really wanted in a mate --- but with the time consuming chaos of all the child rearing years, she never really had much time to dwell on it, and apparently Matt didn't irritate her quite so much, until recently. Now, it seems like that's pretty much all she thinks about. My guess is that they won't be staying together much longer, and it will break Matt's heart because he seems to be very much in love with her, and she seems to be 'enough' for him --- but sadly, neither seem to be true for Amy.