Before Midnight
The Before Trilogy is one of the most romantic films I've witnessed. The fact it's based on a real life experience of Richard Linklater (the director) makes it much more romantic, but the fact, the real Celine never got to see that the before sunrise was made for her and she passed away makes it sad too. This makes the before trilogy much more romantic and realistic, every word feels real, every sentence feels like a connection. The end of before midnight shows how important it is to have mutual understanding and talk things out rather than just ending things.