lol Ok last clues: Goes by two names depending on where you live I guess & One of The Lord of the Rings Director's first films
I'll give it 10 mins then post another picture, there's very few borderline ones with this film. Some of the scenes are very iconic and would give it away pretty quickly.
I've got it in my head that she is the wife/gf of the main character - possibly based on a true story
She's actually the wife of the main characters best friend, but there is a romantic obsessive element to it too. To say it is "highly rated" is a bit of an understatement, one the most well regarded AFI films.