The speaker sits outside with a warm coffee, alone in another December, and imagines the person they love coming back. From there the poem becomes a list of what is missed: a voice, a smile, a touch, hugs, a kiss, the words "I love you" (the "three words"). Each list ends with the same line, "And that moments for a while," which suggests those moments were brief, or that the speaker keeps returning to them for a while in memory. The wording is a little unclear, but the repeated line works like a sigh.
The memories get more specific near the end: walking under a street light and slowly dancing. The speaker calls these "aesthetic moments" and admits they will never come again. The final lines, "So I watch that again," suggest replaying the memories in their mind. The mood is quiet, tender and sad. Nothing is resolved, and the speaker accepts that missing this person "will always be."