Mafalda's speaker has ended a relationship and can't stop questioning it. They admit they caused the breakup, yet say they don't really know what they ended. That confusion runs through the whole poem. They don't regret the decision, and they believe it was right because the two of them "simply weren't meant" for each other. But the doubt and the pain stay anyway.
The poem then turns inward. The speaker wonders whether they're even sad about the relationship ending, or whether they're just hurting because of how they feel now. That leads to a bigger fear: maybe they aren't meant for anyone. The final stanza is the most raw. The speaker half wants to believe that fear is a lie, but also needs to feel it fully. The mood is quiet, uncertain and lonely, with short, plain lines that sound like someone thinking out loud and ending on a clear, aching wish to belong to someone.