i think the movie wisely displays the act of betraying a husband, without commenting it too much. it explains with little hints how passion (and essential thoughts coming with the act) take over the life of the protagonist. with that parallel relationship she finds the time to see what she needs, what the physical contacts really mean for her, so it helped me to understand a bit more of the mind of such persons. contrary to another comment, i for myself don't think it's really unrealistic, but the movie just shows how secretive people go through deep private experiences, and while they do so, they'll eventually clash with people who, if they're normally open and talkative and get confronted with this, turn into anxious, unsure and possessive partners in such relationships. the movie is a bit light though on that aspect, it's a bit shallow overall on psychology and it will depend on your own thoughts and considerations after to fill it in in a way, on that side.
Review of The Secret
The Secret
(2000)
good movie for a thought on trying to understand opposite personalities
30 June 2004