Two short lines carry a whole story of loss. The speaker says that time passed by and so did "you," then that the sun drifted and "you" did too. The pairing matters: the person who left is placed alongside things that cannot be held onto. Time and the sun move on no matter what anyone wants, and the poem suggests the loved one's leaving felt just as natural and just as impossible to stop.
The speaker's feelings are never stated outright, which makes them easier to sense. There is no anger and no pleading. The tone is quiet, almost resigned, as if the speaker has watched someone slip away and can only describe it. The word "drifted" is gentle, which hints at a parting without a fight, perhaps even without a clear moment of goodbye.
The title, "Love Until the End," adds a layer. Judging by it, the love may outlast the leaving, and the plain, bare lines read like the stillness that follows. The mood is wistful, calm, and a little empty.