Part of the problem was that he needed a title: he didn't want to use "The Way You Look Tonight," because there there was already a song with that name.
As de Burgh tells it, five months later he saw Diane, wearing red, across a crowded nightclub, which gave him the idea for the title.
On the British TV series This Is Your Life, de Burgh said that the song was inspired by the memory of when he first saw Diane, and how men so often cannot even remember what their wives were wearing when they first met.
On his website, he said the song was not specifically about Diane, but about appreciating the most important people in our lives, who we often take for granted; how we often fail to notice what attracted us to another person in the first place.
In this account, he was already married to Diane but didn't realize it was her when he spotted her across the room.
http://www.songfacts.com/detail.php?id=3060
Nice post Luv, happy weekend to you!