I went to a friend's wedding where the first dance was to this song
called The Special Two. It's a stunning song.
The chorus makes sense for a wedding (we'll bleed together, we won't need others, we'll always be the special two) The first verse however makes it really very clear that this is about a wife who cheated on her husband (When you're young you have this image of your life: That you'll be scrupulous and one day even make a wife. And you make boundaries you'd never dream to cross, And if you happen to you wake completely lost.) It's not ambiguious in the slightest. I remember looking around the table and everyone had the same look on their face.
My DF and I are going with our first dance to 'I Can't Help Falling in Love' Lovely song and it makes me tear up every time.