What film about young boy lives with older married women and seduce her?

The film you're referring to is likely "Notes on a Scandal," which explores the complicated relationship between a young boy and an older married woman, highlighting themes of seduction and manipulation. The story revolves around the consequences of their affair, as it becomes entangled with the lives of others, particularly the woman’s friend, who discovers their secret. The film delves into issues of obsession, betrayal, and the moral complexities of their actions.