TELL me why, behind thee,
I see always the shadow of another lover?
Is it real
Or is this the thrice-damned memory of a better happiness?
Plague on him if he be dead
Plague on him if he be alive
A swinish numbskull
To intrude his shade
Always between me and my peace.

Stephen Crane

http://www.poemhunter.com/poem/tell-me-why-2/