Focus (2015) on Netflix

Nicky is an accomplished con man. When a young grafter, Jess tries to take him, he sees right through her. He takes her under his wing and things between them get personal. When they pull a big score, Nicky decides to let her go because he thinks getting involved with her is not good. Three years later, Nicky's working for a guy to give a competitor some false info. But before he begins, he discovers Jess is with the guy and it ticks him off. He tries to apologize but she doesn't want to accept.