Sinethemba Mnukwa's poem is about a man undone by love. It begins with a promise, "through tough and good times," made when love was all he thought about. Now the situation has flipped: he is running from the medication he needs, which suggests he is struggling to cope with what has happened to him.
The speaker describes him in stark terms: a "monster in his own body," a "zombie," awake at night with insomnia for company. Yet the poem insists he never thought about death. He knew his purpose, and he was simply "blinded by love." The line about four letters turning him into a sadist suggests that love itself became the thing that hurt him.
The ending is the most telling part. He "wasn't sad." He was trying to explain his pain to people who never understood it. The mood is heavy, numb and lonely, and the poem leaves us with the sense that being misunderstood hurts as much as the heartbreak.