Farewell... part I

Sweetheart, do not love to long:
I loved long and long,
And grew to be out of fashion
Like an old song.

All through the years of our youth
Neither could have known
Their own thought from the other's,
We were so much at one.

But O, in a minute she changed -
O do not love to long,
Or you will grow out of fashion
Like an old song.

W.B. Yeats