Grief and guilt run through this poem, which is built almost entirely out of questions. The speaker starts by flipping between opposites: I never loved you, I did love you, you caused my pain, you didn't. The back-and-forth feels less like a real argument and more like a mind that can't settle on anything.
Halfway through, the poem gets more personal. The speaker says "what if" is what everyone asks after something bad happens, and the examples suggest a loss: "what if I didn't say that to him he would still be here?" Judging by the lines, the speaker blames themselves for something said, or something not said, like "I love you more" or "yes." We don't learn exactly what happened, and that vagueness makes it feel raw.
The mood is anxious, regretful, and stuck. The poem ends by repeating its first painful line, "What if I never loved you," so the speaker circles back to where they began, unable to escape.