Wife cheating on husband with her client film

I don’t remember much about the film, but it starts with the main character (the wife) being questioned by someone (I think a psychologist, but I’m not 100% sure) and telling her and her husbands love story or something (I’m pretty sure it takes years after the main events in the film, I think the main character was very old in this scene), also I think the woman was smoking. She and her husband have known each other all their lives, since early childhood and fell in love. They’ve been married for years. The woman works as some kind of consultant or something for rich people and she’s got the new client, at some point they were flying on his plane together. She started an affair with him, their relationship was toxic, he was a very mean man. The last thing I remember is how the woman’s mother (?) came to visit and they had a fight. Also she and her husband have kids.
Other details: I’m pretty sure all the cast were black people and in the trailer for this film played Love the way you lie part 2 by Rihanna, Eminem.