When you're in love, you do strange things, but they don't seem strange at the time. Last night we watched
Deep End, a 1970 movie starring Jane Asher which explored this theme well. The main character is a shy 15 year old boy, who becomes obsessed with the lovely Ms Asher. His actions all seem more or less logical in the context of the story; but somehow they lead to a brilliant and disquieting final scene where they're standing in a disused swimming pool, boiling snow in an electric kettle that's been hastily connected to the overhead floodlights and straining the result through her underwear.
Well, if you found that intriguing, consider checking out the movie. And you might also want to read
The Innocent, where a similarly naive male character gets involved with another older woman, does a number of seemingly logical things, and ends up in an even more bizarre situation...