The speaker has just ended a relationship, or something close to one, and feels awful about it. The epigraph, "Moved on before I left," hints that the other person had already pulled away, so the breakup may have been a step the speaker took after the real ending had happened. The short, blunt lines and the repeated "really" make the pain sound raw rather than polished.
The middle stanza shows a stalemate: each person wanted something and never got it from the other. The speaker doesn't blame anyone clearly. Then comes the strange admission that they upset the other person and "never explained why," just going silent, not texting, not smiling. It reads like someone who couldn't find the words and let distance speak instead.
The mood is flat, tired, and quietly lonely. The final lines, driving home alone and saying "I'm ok with that," feel less like peace and more like a person trying to convince themselves.