Miller's Crossing (1990) on Netflix

It's Prohibition era 1930s as gang wars tear apart the city of gang lord Leo and his lieutenant Tom Regan. Tom is upset when Leo declines underling Johnny Caspar's request to kill the crooked Bernie. Despite Tom's objections, Leo thinks he made the right decision because Bernie is Verna's brother and Verna is Leo's girl. Unfortunately, Caspar seems to be growing in power and just when Leo needs Tom's help most Tom admits he's been fooling around with Verna. Tom is thrown out of Leo's mob and with nothing else to do he decides to join Caspar. But Tom is also talking to Bernie and Verna, and Caspar's ruthless henchman Eddie Dane starts to get suspicious. His suspicions rise when Tom is ordered to kill Bernie himself, but no one knows whether or not Tom carried out the order. Leaving Caspar searching for his desired power, Dane searching for answers, Verna searching for her brother and Tom searching for his own heart... if he has one anymore.