Dance with a Stranger (1985)

"It wasn't simply love. It was a case of cold-blooded passion."

Ruth Ellis lives with her ten-year old son Andy next to a night club. One night she meets David Blakely, and they start a love affair. However, for David with his upper-class background, it is impossible to uphold the relationship. He breaks up with her, something which makes Ellis, obsessed by him, very upset.