The speaker is replaying a failed attempt to reach someone, and the poem reads like a spiral of self-blame. The title gives us a small, telling image: supermarket flowers thrown from a windowsill, as if the speaker is getting rid of a gesture that didn't work out. Judging by the lines, the flowers and the hoped-for text were meant to connect with this person, and now the speaker assumes they were tossed aside.
What stands out is the repeated "I wished." The speaker says they wished for the rejection itself, which sounds odd, but it seems to be a way of taking control. If they expected the hurt, it can't surprise them. Yet the ending breaks that defense. The questions "What was I thinking" and "Why did I wish for you" are raw and unguarded. The mood is bitter, embarrassed and lonely, with a flat, plain tone that makes the sadness feel more honest.