The Classic Heartbreak

I've had the thought that the Boulevard of Broken Dreams runs deep,
The size of the Vegas strip, running through my mind,
Where sits the Home of the Blues,
The Heartbreak Hotel on Lonely Street,
And the Hotel California farther down the Strip,

And all these places bind us together.
We can find a dusty wedding chapel,
A funeral parlor,

And a long shadow casts an eternal dusk across the town.

Misery loves company.

And the memories dance in the courtyard,
And we can never leave the Boulevard.

Van Gogh has said The Sadness will last forever,
But I've never believed it.

The sadness doesn't last forever,
The monuments dedicated to the sadness do.

Created in our memories and never taken down,
They live in a distant part in our mind,
In an ever-shifting land that spans for miles.

And at the edge lies a rainbow,
Which we can decide to pass through freely.

Why are there so many songs about rainbows, and what's on the other side?