A not quite Villanelle.

The past is past, it's gone it's flown.
No point dwelling on regret;
They won't come back the chances blown.

For all we sit and sigh and groan.
However much we sit and fret.
The past is past, it's gone it's flown.

The things back then we wished we'd known
Though there's lessons we won't forget.
They won't come back the chances blown.

There may be chances to atone
A different option, better bet.
The past is past, it's gone, its flown.

We learned the lessons we have grown
The future hasn't happened yet
There'll be new chances not yet blown.

Let go the past, though don't forget
We'll grasp the future not yet met.
The past is past, it's gone it's flown
The future we will make our own.

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