I hate quoting wikipedia but you might want to read this.
Suppose for a moment that the heart has two heads, that the heart has been chained and dunked in a glass booth filled with river water. The heart is monologuing about hesitation and fulfillment while behind the red brocade the heart is drowning. - R.S
I read the last line as "underneath the stairs". Yeah. I do confuse myself on a rather regular basis.
That said, I believe the reason why Dreamwalker linked you to Wikipedia is because you're missing a rather signature element of haiku -- the kiri, or cut. There's more to a haiku than just the syllable pattern. Haiku endeavor to be profound in how brief they are. I do not see any of that profundity here.
See, the kiri is rather essential as it marks the turning point or twist of the haiku. The kiri signals to the reader that, "Hey! Your expectations are about to be overturned!" or "Something is about to be revealed!"
This attempt lacks that for the last line is a direct and predictable result of the first two. No new light is shed upon the situation. No expectations are overturned; instead, they are reinforced, and that spells out death for a haiku.
Haiku are deceptively difficult to write well. All I can say is keep practicing.