The story was about a married couple that hates each other. They both hire a hitman (the same one) to kill their spouse. He decides to give them a lesson, I think?
Thanks! But that’s not it. The one I have in mind came out a few years earlier.
The Ref (1994)?
Not a hitman but a burglar criminal involved with a couple.
Well, The War of the Roses is about a married couple that hate each other…
The War of the Roses (1989) - IMDb