Betrayal by harold pinter please explain nicely and not just other sources

Consider the poem "The Lake Isle of Innisfree" by Yeats. How does its content (and its author) relate to Robert?

The Lake Isle of Innisfree

By William Butler Yeats

I will arise and go now, and go to Innisfree,

And a small cabin build there, of clay and wattles made;

Nine bean-rows will I have there, a hive for the honey-bee,

And live alone in the bee-loud glade.

And I shall have some peace there, for peace comes dropping slow,

Dropping from the veils of the morning to where the cricket sings;

There midnight’s all a glimmer, and noon a purple glow,

And evening full of the linnet’s wings.

I will arise and go now, for always night and day

I hear lake water lapping with low sounds by the shore;

While I stand on the roadway, or on