IMO their marriage went downhill when Jessica's career really took off and she started losing weight and getting in shape for "Dukes of Hazzard". Before that, regardless of her being Suzy homemaker or dense or not, she seemed to really love Nick and want to be his wife above all else, regardless if she was "good" at it. Then she seemed to act as if she were too big for her britches, I think that fame and all the attention she got from getting in shape for the movie went straight to her head. All of a sudden she seemed to think she was a little better than Nick.
In fact, her whole family seems to have been effected by fame. Look at pictures of her mother recently...BOTOX!!!!! Her father is just creepy but all of a sudden he fancies himself a Hollywood hotshot, a force to be reckoned with. I don't care for any of the Simpson's now, I don't necessarily dislike them but their attitude sucks. IMO.
I hope Nick finds a nice woman who will appreciate him because he seems like a nice guy. I don't know if he cheated on her but if he did, he shouldn't have. However, who knows what the h*ll he had to put up with from Miss Hottie and her creepy, pushy father.
JMO