I'm pretty sure "half dead" is a double entendre and the narrator is middle aged (or nearly so) at the time the mentioned relationship ended, hence "half dead."
The song overall seems to be about a romantic relationship that was years long, probably comprised the majority of both partners' romantic lives, and ended in a subdued manner rather than spectacular failure. The muted way the lyrics are sung gives off a feeling of "Huh. What now?" rather than sadness or longing, or really any other strong emotion.
I'm pretty sure "half dead" is a double entendre and the narrator is middle aged (or nearly so) at the time the mentioned relationship ended, hence "half dead."
The song overall seems to be about a romantic relationship that was years long, probably comprised the majority of both partners' romantic lives, and ended in a subdued manner rather than spectacular failure. The muted way the lyrics are sung gives off a feeling of "Huh. What now?" rather than sadness or longing, or really any other strong emotion.