Why we have to split For no reason?

We used to fight
We used to unite
We used to scream
We used to dream
But we never parted

We used to walk
We used to sit
We used to talk
We used to be quite
But we never parted

We used to kiss
We used to mess
We used to caress
We used to push
But we never parted

We used to hug
We used to exit
We used to cuddle
We used to muddle
But we never parted

Why we have to split
For no reason