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I think you might be referring to the iconic movie "American Beauty" (1999) directed by Sam Mendes. The film features a character named Ricky Fitts, played by Wes Bentley, who is a 17-year-old boy who becomes infatuated with a middle-aged woman named Lester Burnham, played by Kevin Spacey.

Lester is a married man who is going through a midlife crisis and is having an affair with a blonde woman named Angela Hayes, played by Mena Suvari. The film explores themes of suburban ennui, teenage angst, and the complexities of human relationships.

The movie received widespread critical acclaim and won several awards, including the Academy Award for Best Original Screenplay. It's considered a classic of contemporary American cinema and is often cited as one of the greatest films of the 1990s.

Is this the movie you were thinking of?