They were both happily married.
They were both parents.
One day SMYB Guy appeared again. They both knew what happened in that house but ignored it. They talked like two old friends, good old friends. Shared ideas on parenthood, comforted each other when they felt insufficent, shared songs... Oooh, songs!
"In my mind there is a house of love
A house of happiness
The lighting in our room is shining on your pretty face
The living room is lively
In my mind there is a house of love
Oh, love
All I want is you
You
Oh, you!"
I don't think that it's because the lyrics but just the song itself.