Hans's "one day" is about looking back on a relationship that hurt and finally seeing it clearly. The poem is told in the third person, but it reads like the speaker talking about herself from a little distance. She realizes she was foolish to love someone who didn't care how she felt and who treated her as if she were cold and heartless. The poem then reveals the truth underneath: she was "dying inside" the whole time.
The mood is quiet, tired, and honest rather than angry. Healing here isn't tidy. Sometimes the old feelings come back, and sometimes she doesn't care at all. That back-and-forth makes the poem feel believable. It ends gently, with no big victory, just a small hope that with "a little time" she can find herself again. The plain wording and lack of polish suit the subject, since it sounds like someone thinking out loud.