Not up to you

I walked into you, and you rejected my argument.
-It's not up to this, or that, Honey-, you said.
-So, what is up to?-, I asked.
-It's just not up to us. This is not us, it's just something we made up. It was good for a while. It was neat for a while, but now it's just fallin' into pieces-
-So, it's not up to me...and it's not up to you...not up to anything we do-
-Yes, that's the way I see things now-
-OK, so I guess this is the end, right?-
-It's only a brief farewell, my love-
I walked out the room thinking how wise and loving you were.