Before watching the movie:
This is billed as a comedy, but it sounds like it could be more serious. How many moody dramas follow the dissolution of a marriage because the man had his head turned by a beautiful woman? The summaries point out that he’s happily married at the start, which makes it sound sadder.
On the other hand, a lot of comedies track the beginning of a relationship at the expense of another, and Wilder would do well at the flustered sort of unfaithful man like the type in The Seven Year Itch.