Written as a quiet farewell to someone from the past, the poem is about moving on without pretending the other person never mattered. The speaker admits that thoughts of this person still come, though only "momentarily." They won't claim the person has been wiped from their memory, and that honesty gives the poem its calm, believable tone.
What the speaker feels is mixed. There is gratitude for the happy moments that sometimes replay, and the line about "our forever that never happened" suggests a future the two once imagined but never got. Still, the ending turns firm: the speaker hopes they'll never meet again. That doesn't read as hatred so much as a wish to protect the peace they've found, since seeing each other might reopen things.
The mood is soft, wistful and a little sad, but steady. The plain, conversational wording and the lack of punctuation make it feel like a private thought being said aloud, as if the speaker is closing a chapter gently rather than slamming a door.