The last words of the lines of this sonnet are the same as those of a sonnet by Edna St Vincent Millay, "What lips my lips have kissed, and where, and why...".  There is no other connection between the two poems.
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I cannot sleep tonight, and you know why.
You know how many weary hours I've lain
upon my bed and listened to the rain
lashing the window, and the mournful sigh
the wind makes. You have heard mine in reply.
I know you know the reason for my pain.
I know you know why, over and again,
I've wept out loud. I know you saw me cry
as I remembered carving on that tree
your name and mine. You were the only one
I needed then. You know, just as before,
how much I need you yet, but you have gone.
Only your spirit now still lives in me,
and I can never hope for any more.