When Harry Met Sally... (1989) on Netflix

Harry and Sally first meet as they finish college in Chicago and spend 18 hours together in a car headed to New York. They don't quite hit off, particularly after Harry opines that a man and a woman can never be just friends because he'll always want to have sex with her. Over the next 10 years, they occasionally meet and soon do in fact become fast friends. They share the intimate details of their lives - hopes, dreams, failures and successes - and in the process also fall in love. It's not evident that will be able to sustain their relationship once they sleep together however.