I'll chime in. For me, it's a song about me and my wife of 29 years. It's a song about what happens to a man and woman after many years together. It's not always good; in fact, it's not infrequently bad (your seven worlds collide; your words devour my heart, put me to shame). It can be heartbreaking (waiting for the thrill to return). But you stick it out. I make (many) mistakes; I can be annoying (so can you). But I offer love. In the end, that's all that matters.