Requited (2011)

Nicolas, a young man in his mid 20s, struggles to decide whether or not to go to the wedding of his best friend from high school, Aaron, who he's always been quietly in love with. The two had a falling out years earlier after Nicolas inexplicably kissed Aaron's girlfriend. Nicolas clings to an idealized image of his former friend, unconsciously sabotaging his own happiness in the process. The film is a realistic slice-of-life that poses the question "How do you get over something you never had?"