These wouldn't be for an upcoming ceremony that you may or may not be involved in by any chance Char? ;)

I like the following:
I Love You (Always Forever) by Donna Lewis.
http://www.youtube.com/watch?v=qLPXsmo0ZJc

The Way You Look Tonight by Elton John:
http://www.youtube.com/watch?v=tgBzy0-7B-4
(We danced to this one at our wedding)

World of Own by Westlife:
http://www.youtube.com/watch?v=r8hl9zEFK6s
(Though this one does could sound more like from the perspective of people being apart)