A Perfect Murder with Michael Douglas released in 1998 and Unfaithful with Richard Gere released in 2002. I’ve watched both them. If you’ve watched too then you would be known to similarities between those two movies.
In A Perfect Murder Michael Douglas comes to know about affair between his wife and a painter. Michael Douglas is a rich person in the movie so he shows some sensibility.
In Unfaithful Richard Gere faces nearly same situation when his wife gets involved in affair with a bookkeeper. There Richard Gere makes a mistake and accidently kills that bookkeeper.
Both Richard Gere and Michael Douglas are rich persons in the movies. They both deal with their wives’ affairs. Their wives make affair with ordinary persons.
If you’ve not watched those two movies then watch them then you’ll come to know similarities between A Perfect Murder and Unfaithful very well. Even imdb ratings of both movies are nearly same. A Perfect Murder has 6.4 imdb rating and Unfaithful has 6.6 imdb rating.