I saw this movie about a year ago. The title was in French, however, the movie itself was in English.
The plot: the rich man falls in love with his coworker’s fiancée. The rich man is the boss of the other man, so he would promote him on a purpose. At first, the woman hated the boss, but later they fell in love. I think they ran away together or something like this. They started living together and only then, the woman got to know his real side. He was very toxic and jealous. In the end, he was abusing her psychologically, physically and sexually (he raped her). He even found some ex-lover of hers, which was a conductor (I think) and brought her to a performance of his, just to remind her.
It wasn’t an old movie, maybe between 2007-2017.