Someone is trying to talk themselves out of caring about a relationship that has ended. The speaker runs through what once held the two people together: shared goals, promises, and compliments. Each one is followed by the same flat line, "Those shouldn't matter anymore." The word "shouldn't" gives the game away. The speaker isn't saying these things no longer matter, only that they ought not to.
The poem also admits how the relationship soured. Promises were made "only to break them," and the compliments seem to have hidden people's "true selves." Now they are mean to each other and have gone separate ways.
The ending breaks the pattern. The repeated statements give way to three questions, and the speaker even wonders why the other person cares too. The mood is tired, bitter, and quietly hurt. The short, repetitive lines sound like someone rehearsing a lesson they can't make themselves believe.