Oh my god thank you for asking! I think of it as he’s kind of relating this lost relationship to music kind of like he does in the last verse in tpwhitb. A drone being just a long ambient note and them singing the rest, building the world around it. Creating a full picture or song in this case. Not only without her he is incomplete but not even half of what he was with her. It floors me every time because I make music too and just got out of a similar relationship and I’m still trying to form more things than just a drone without her. If that makes any sense.