"It's the threatened silence that I don't like. If I'm going to be left alone, leave me - let me go, and I have a promise to break, so that I can show myself just what this has meant to me - this brief flare of emotional exhilaration in life - and then hide it all away again."
You break your promise, and I'll keep mine. If you've broken your promise, I'll keep mine. I never show it, but I still care.
Even if it doesn't mean anything, I will keep my promise. I keep my promises - that, if nothing else, means something.