Lance Harbison's poem is a short, raw question aimed at someone the speaker loved. It begins with three simple lines that build on each other: "I chose you," "You chose me," "We chose each-other." The repetition makes the relationship sound deliberate and equal. Neither person drifted into it; both decided on it, and that matters to the speaker.
Then the tone shifts. The speaker points to "all our memories" as if they were evidence, and asks how the other person can "give up so easily." The word "easily" carries the hurt. The speaker seems to feel that something built together has been dropped without much effort or care.
The mood is wounded and bewildered rather than furious. The plain language and the trailing double full stop after "each-other" suggest a pause, maybe a catch in the voice. The poem doesn't say why the relationship is ending, and that gap leaves the speaker's confusion hanging in the air.