This song is about a stable, long-term relationship. Sounds like it would be a boring topic for a song! But still, any relationship is made up of individuals. So this song is about how the history of relationship varies depending on who you ask. Even though the people in the relationship have experienced it together, they will almost certainly tell you a slightly different history. After all, memory is selective and, well, creative. So this song, in its way, acknowledges this and sees it for what it is. We live through stories and everyone has their own!
The song is available on all streaming services, and if you do not have a music service, you can access the song on YouTube: https://youtu.be/LvcX7L1DJLs
If you would like to check out the lyrics: http://craigjhansen.com/apart/