Nkazimulo's speaker imagines a chance meeting with an ex in a shopping mall, and the whole poem is a kind of rehearsal for that moment. He pictures her in the black dress he liked, looking beautiful, and already holding back tears because she is with someone new. What he feels most is regret and self-doubt. He assumes the new man is kinder, more attentive and "twice the man" he ever was, and he measures himself against that imagined rival until there is almost nothing left.
The turn comes near the end. He admits that he never tried, that he stood by while she was hurt. The last lines invite her to say how much better her life is and how little she misses him, as if he is asking to be punished. The mood is sad and self-blaming, with a bitter edge. The playful title, "Funny seeing you here," sounds casual, which makes the pain underneath it sharper.