William Watson - Estrangement

So, without overt breach, we fall apart,
Tacitly sunder--neither you nor I
Conscious of one intelligible Why,
And both, from severance, winning equal smart.
So, with resigned and acquiescent heart,
Whene'er your name on some chance lip may lie,
I seem to see an alien shade pass by,
A spirit wherein I have no lot or part.
Thus may a captive, in some fortress grim,
From casual speech betwixt his warders, learn
That June on her triumphant progress goes
Through arched and bannered woodlands; while for him
She is a legend emptied of concern,
And idle is the rumour of the rose.

William Watson

http://www.poemhunter.com/poem/estrangement-4/